John Muir (21 April 1838 – 24 December 1914) was a Scottish born American naturalist, author, and early advocate of preservation of wilderness in the United States. His letters, essays, and books telling of his adventures in nature, especially in the Sierra Nevada mountains of California, have been read by millions. His activism helped to save the Yosemite Valley, Sequoia National Park and other wilderness areas. The Sierra Club, which he founded, is now one of the most important conservation organizations in the United States. One of the most well known hiking trails in the U.S., the 211 mile (340 km) John Muir Trail, was named in his honor. Other places named in his honor are Muir Woods National Monument, Muir Beach, John Muir College, Mount Muir, Camp Muir and Muir Glacier.

In his later life, Muir devoted most of his time to the preservation of the Western forests. He petitioned the U.S. Congress for the National Park Bill that was passed in 1899, establishing both Yosemite and Sequoia National Parks. Because of the spiritual quality and enthusiasm toward nature expressed in his writings, he was able to inspire readers, including presidents and congressmen, to take action to help preserve large nature areas. He is today referred to as the "Father of the National Parks," and the National Park Service produced a short documentary on his life. Muir's biographer, Steven J. Holmes, states that Muir has become "one of the patron saints of twentieth century American environmental activity," both political and recreational. As a result, his writings are commonly discussed in books and journals, and he is often quoted in books by nature photographers such as Ansel Adams. "Muir has profoundly shaped the very categories through which Americans understand and envision their relationships with the natural world," writes Holmes. Muir was noted for being an ecological thinker, political spokesman, and religious prophet, whose writings became a personal guide into nature for countless individuals, making his name "almost ubiquitous" in the modern environmental consciousness. According to author William Anderson, Muir exemplified "the archetype of our oneness with the earth", while biographer Donald Worster says he understood his mission to be, "saving the American soul from total surrender to materialism."

John Muir's birthplace was a three story stone house in Dunbar, East Lothian, Scotland. His parents were Daniel Muir and Ann Gilrye. He was the third of eight children: Margaret, Sarah, David, Daniel, Ann and Mary (twins), and the American born Joanna. In his autobiography, he described his boyhood pursuits, which included fighting, either by re-enacting romantic battles of the Scottish Wars of Independence or just scrapping on the playground, and hunting for birds' nests (ostensibly to one-up his fellows as they compared notes on who knew where the most were located). Author Amy Marquis notes that he began his "love affair" with nature while young, and implies that it may have been in reaction to his strict religious upbringing. "His father believed that anything that distracted from Bible studies was frivolous and punishable." But the young Muir was a "restless spirit" and especially "prone to lashings." The family were members of the Presbyterian Church while in Scotland, but joined the Disciples of Christ in the United States.

In 1849, Muir's family emigrated to the United States, starting a farm near Portage, Wisconsin, called Fountain Lake Farm. It has been designated a National Historic Landmark. Stephen Fox recounts that Muir's father found the Church of Scotland insufficiently strict in faith and practice, leading to their emigration and joining a congregation of the Campbellite Restoration Movement, called the Disciples of Christ. By age 11, young Muir had learned to recite "by heart and by sore flesh" all of the New Testament and most of the Old Testament. But in maturity, Muir may have changed his orthodox beliefs. In a letter to his fond friend Emily Pelton, dated 23 May 1865, he wrote, "I never tried to abandon creeds or code of civilization; they went away of their own accord... without leaving any consciousness of loss." Elsewhere in his writings, he described the conventional image of a Creator, "as purely a manufactured article as any puppet of a half - penny theater."

Muir remained, though, a deeply religious man, writing, "We all flow from one fountain — Soul. All are expressions of one love. God does not appear, and flow out, only from narrow chinks and round bored wells here and there in favored races and places, but He flows in grand undivided currents, shoreless and boundless over creeds and forms and all kinds of civilizations and peoples and beasts, saturating all and fountainizing all."

At age 22, Muir enrolled at the University of Wisconsin – Madison, paying his own way for several years. There, under a towering black locust tree beside North Hall, Muir took his first botany lesson. A fellow student plucked a flower from the tree and used it to explain how the grand locust is a member of the pea family, related to the straggling pea plant. Fifty years later, the naturalist Muir described the day in his autobiography. "This fine lesson charmed me and sent me flying to the woods and meadows in wild enthusiasm." As a freshman Muir studied chemistry with Professor Ezra Carr and his wife Jeanne; they became lifelong friends and Muir developed a lifelong interest in chemistry and the sciences. Muir took an eclectic approach to his studies, attending classes for two years but never being listed higher than a first year student due to his unusual selection of courses. Records showed his class status as "irregular gent" and, even though he never graduated, he learned enough geology and botany to inform his later wanderings.

In 1863 his brother Dan left Wisconsin for Canada to avoid the draft. In 1864, Muir left school to go to Canada to avoid the military draft, spending the spring, summer, and fall wandering the woods and swamps around Lake Huron collecting plants. With his money running out and winter coming, he met up with his brother Dan in Ontario, where the two worked at a sawmill on the shore of Lake Huron until the summer of 1865. Roderick Nash has described Muir's travels in Canada as journeys into wilderness to avoid military service.

Muir returned to the United States in March 1866, winding up in Indianapolis to work as a sawyer in a factory that made wagon wheels; he was paid $22 a week. He proved valuable to his employers because of his inventiveness in improving the machines and processes. In early March 1867, an accident changed the course of his life: a tool he was using slipped and struck him in the eye. He was confined to a darkened room for six weeks, worried if he’d ever regain his sight. When he did, "he saw the world — and his purpose — in a new light," writes Marquis. Muir later wrote, "This affliction has driven me to the sweet fields. God has to nearly kill us sometimes, to teach us lessons." From that point on, he determined to "be true to myself" and follow his dream of exploration and study of plants.

In September 1867, Muir undertook a walk of about 1,000 miles (1,600 km) from Indiana to Florida, which he recounted in his book A Thousand - Mile Walk to the Gulf. He had no specific route chosen, except to go by the "wildest, leafiest, and least trodden way I could find." Upon reaching Florida, he hoped to board a ship to South America and continue his wandering there. After contracting malaria on Florida's Gulf Coast, he abandoned his plans for South America. Instead, he sailed to New York and booked passage to California.

Arriving in San Francisco in March 1868, Muir immediately left for a week - long visit to Yosemite, a place he had only read about. Seeing it for the first time, Marquis notes that "he was overwhelmed by the landscape, scrambling down steep cliff faces to get a closer look at the waterfalls, whooping and howling at the vistas, jumping tirelessly from flower to flower." "We are now in the mountains and they are in us, kindling enthusiasm, making every nerve quiver, filling every pore and cell of us," Muir later wrote. . . . "No temple made with hands can compare with Yosemite... The grandest of all special temples of Nature." He later returned to Yosemite and worked as a shepherd for a season. He climbed a number of mountains, including Cathedral Peak, Mount Dana and hiked the old Indian trail down Bloody Canyon to Mono Lake.

A gifted inventor, Muir designed a water - powered mill to cut wind - felled trees and he built a small cabin along Yosemite Creek, designing it so that a section of the stream would flow through a corner of the room, where he could enjoy the sound of running water. He lived in the cabin for two years, and wrote about this period in his book First Summer in the Sierra (1911). Muir's biographer, Frederick Turner, notes Muir's journal entry upon first visiting the valley and writes that his description "blazes from the page with the authentic force of a conversion experience."

During these years in Yosemite, Muir was unmarried, often unemployed, with no prospects for a career, and had "periods of anguish," writes naturalist author John Tallmadge. He was sustained by not only the natural environment, but also by reading the essays of naturalist author Ralph Waldo Emerson, who wrote about the very life that Muir was then living. On excursions into the back country of Yosemite, he traveled alone, carrying "only a tin cup, a handful of tea, a loaf of bread, and a copy of Emerson." He usually spent his evenings sitting by a campfire in his overcoat, reading Emerson under the stars. As the years passed, he became a "fixture in the valley," respected for his knowledge of natural history, his skill as a guide, and his vivid storytelling. Visitors to the valley often included scientists, artists, and celebrities, many of whom made a point of meeting with Muir.

In 1871, after Muir had lived in Yosemite for three years, Emerson, with a number of academic friends from Boston, arrived in Yosemite during a tour of the Western United States. The two men met, and according to Tallmadge, "Emerson was delighted to find at the end of his career the prophet - naturalist he had called for so long ago. . . And for Muir, Emerson's visit came like a laying on of hands." Emerson spent only one day with Muir, although he offered him a teaching position at Harvard, which Muir declined. Muir later wrote, "I never for a moment thought of giving up God's big show for a mere profship!"

Pursuit of his love of science, especially geology, often occupied his free time. Muir soon became convinced that glaciers had sculpted many of the features of the valley and surrounding area. This notion was in stark contradiction to the accepted contemporary theory, promulgated by Josiah Whitney (head of the California Geological Survey), which attributed the formation of the valley to a catastrophic earthquake. As Muir's ideas spread, Whitney would try to discredit Muir by branding him as an amateur. But Louis Agassiz, the premier geologist of the day, saw merit in Muir's ideas, and lauded him as "the first man I have ever found who has any adequate conception of glacial action."

In 1871, Muir discovered an active alpine glacier below Merced Peak, which helped his theories gain acceptance. He was a highly productive writer and had many of his accounts and papers published as far away as New York. Muir's former professor at the University of Wisconsin, Ezra Carr, and his wife Jeanne, encouraged Muir to put his ideas into print. They also introduced Muir to notables such as Emerson, as well as leading scientists such as Louis Agassiz, John Tyndall, John Torrey, Clinton Hart Merriam, and Joseph LeConte.

A large earthquake centered near Lone Pine, California, in Owens Valley (1872 Lone Pine earthquake) strongly shook occupants of Yosemite Valley in March 1872. The quake woke Muir in the early morning and he ran out of his cabin "both glad and frightened," exclaiming, "A noble earthquake!" Other valley settlers, who believed Whitney's ideas, feared that the quake was a prelude to a cataclysmic deepening of the valley. Muir had no such fear and promptly made a moonlit survey of new talus piles created by earthquake - triggered rockslides. This event led more people to believe in Muir's ideas about the formation of the valley.

In addition to his geologic studies, Muir also investigated the plant life of the Yosemite area. In 1873 and 1874, he made field studies along the western flank of the Sierra on the distribution and ecology of isolated groves of Giant Sequoia. In 1876, the American Association for the Advancement of Science published Muir's paper on the subject. In the introduction, he explained his purpose: "During the past summer I explored the Sequoia belt of the Sierra Nevada, tracing its boundaries and learning what I could of the post - glacial history of the species, and of its future prospects. . . . Some of the answers obtained to these questions, seem plain and full of significance, and cannot I think, fail to interest every student of natural history."

Muir travelled with the party that landed on Wrangel Island on the USS Corwin and claimed that island for the United States in 1881. He documented this experience in journal entries and newspaper articles which were later compiled and edited to become his book The Cruise of the Corwin. In 1888 after seven years of managing the ranch, his health began to suffer. With his wife's prompting he returned to the hills to recover, climbing Mt. Rainier in Washington and writing Ascent of Mount Rainier.

Muir threw himself into the preservationist role with great vigor. He envisioned the Yosemite area and the Sierra as pristine lands. He saw the greatest threat to the Yosemite area and the Sierra to be livestock, especially domestic sheep, calling them "hoofed locusts." In June 1889, the influential associate editor of Century magazine, Robert Underwood Johnson, camped with Muir in Tuolumne Meadows and saw firsthand the damage a large flock of sheep had done to the grassland. Johnson agreed to publish any article Muir wrote on the subject of excluding livestock from the Sierra high country. He also agreed to use his influence to introduce a bill to Congress to make the Yosemite area into a national park, modeled after Yellowstone National Park.

On 30 September 1890, the U.S. Congress passed a bill that essentially followed recommendations that Muir had suggested in two Century articles, The Treasure of the Yosemite and Features of the Proposed National Park, both published in 1890. But to Muir's dismay, the bill left Yosemite Valley under state control, as it had been since the 1860s.

In early 1892, Professor Henry Senger, a philologist at the University of California, Berkeley contacted Muir with the idea of forming a local 'alpine club' for mountain lovers. Senger and San Francisco attorney Warren Olney sent out invitations "for the purpose of forming a 'Sierra Club.' Mr. John Muir will preside." On May 28, 1892, the first meeting of the Sierra Club was held to write articles of incorporation. One week later Muir was elected president, Olney vice - president, and a board of directors was chosen that included David Starr Jordan, president of the new Stanford University. Muir would remain president until his death 22 years later.

The Sierra Club immediately opposed efforts to reduce Yosemite National Park by half, and began holding educational and scientific meetings. One meeting in the fall of 1895 that included Muir, Joseph LeConte, and William R. Dudley discussed the idea of establishing 'national forest reservations', which would later be called National Forests. The Sierra Club was active in the successful campaign to transfer Yosemite National Park from state to federal control in 1906. The fight to preserve Hetch Hetchy Valley was also taken up by the Sierra Club, with some prominent San Francisco members opposing the fight. Eventually a vote was held that overwhelmingly put the Sierra Club behind the opposition to Hetch Hetchy Dam.

In July 1896, Muir became associated with Gifford Pinchot, a national leader in the conservation movement. Pinchot was the first head of the United States Forest Service and a leading spokesman for the sustainable use of natural resources for the benefit of the people. His views eventually clashed with Muir and highlighted two diverging views of the use of the country's natural resources. Pinchot saw conservation as a means of managing the nation's natural resources for long term sustainable commercial use. As a professional forester, his view was that "forestry is tree farming," without destroying the long term viability of the forests. Muir valued nature for its spiritual and transcendental qualities. In one essay about the National Parks, he referred to them as "places for rest, inspiration, and prayers." He often encouraged city dwellers to experience nature for its spiritual nourishment. Both men opposed reckless exploitation of natural resources, including clear cutting of forests. Even Muir acknowledged the need for timber and the forests to provide it, but Pinchot's view of wilderness management was far more utilitarian.

Their friendship ended late in the summer of 1897 when Pinchot released a statement to a Seattle newspaper supporting sheep grazing in forest reserves. Muir confronted Pinchot and demanded an explanation. When Pinchot reiterated his position, Muir told him: "I don't want any thing more to do with you." This philosophical divide soon expanded and split the conservation movement into two camps: the preservationists, led by Muir, and Pinchot's camp, who co-opted the term "conservation." The two men debated their positions in popular magazines, such as Outlook, Harper's Weekly, Atlantic Monthly, World's Work, and Century. Their contrasting views were highlighted again when the United States was deciding whether to dam Hetch Hetchy Valley. Pinchot favored the damming of the valley as "the highest possible use which could be made of it." In contrast, Muir proclaimed, "Dam Hetch Hetchy! As well dam for water - tanks the people's cathedrals and churches, for no holier temple has ever been consecrated by the hearts of man."

In 1899, Muir accompanied railroad executive E.H. Harriman and esteemed scientists on the famous exploratory voyage along the Alaska coast aboard the luxuriously refitted 250 foot (76 m) steamer, the George W. Elder. He would later rely on his friendship with Harriman to apply political pressure on Congress to pass conservation legislation.

In 1903, President Theodore Roosevelt accompanied Muir on a visit to Yosemite. Muir joined Roosevelt in Oakland, California, for the train trip to Raymond. The presidential entourage then traveled by stagecoach into the park. While traveling to the park, Muir told the president about state mismanagement of the valley and rampant exploitation of the valley's resources. Even before they entered the park, he was able to convince Roosevelt that the best way to protect the valley was through federal control and management.

After entering the park and seeing the magnificent splendor of the valley, the president asked Muir to show him the real Yosemite. Muir and Roosevelt set off largely by themselves and camped in the back country. The duo talked late into the night, slept in the brisk open air of Glacier Point, and were dusted by a fresh snowfall in the morning. It was a night Roosevelt would never forget.

Muir then increased efforts by the Sierra Club to consolidate park management. In 1905 Congress transferred the Mariposa Grove and Yosemite Valley to the park.

Muir's attitude toward Native Americans evolved over his life. His earliest encounters were with the Winnebago Indians in Wisconsin, who begged for food and stole his favorite horse. In spite of that, he had a great deal of sympathy for their "being robbed of their lands and pushed ruthlessly back into narrower and narrower limits by alien races who were cutting off their means of livelihood." His early encounters with the Paiute in California left him feeling ambivalent after seeing their lifestyle, which he described as "lazy" and "superstitious". Carolyn Merchant criticized Muir, believing that he wrote disparagingly of the Native Americans he encountered in his early explorations. Later, after living with Native Americans, he praised and grew more respectful of their low impact on the wilderness, compared to the heavy impact by European - Americans.

With population growth continuing in San Francisco, political pressure increased to dam the Tuolumne River for use as a water reservoir. Muir passionately opposed the damming of Hetch Hetchy Valley because he found Hetch Hetchy as stunning as Yosemite Valley. Muir, the Sierra Club and Robert Underwood Johnson fought against inundating the valley. Muir wrote to President Roosevelt pleading for him to scuttle the project. Roosevelt's successor, William Howard Taft, suspended the Interior Department's approval for the Hetch Hetchy right - of - way. After years of national debate, Taft's successor Woodrow Wilson signed the bill authorizing the dam into law on December 19, 1913. Muir felt a great loss from the destruction of the valley, his last major battle. He wrote to his friend Vernon Kellogg, "As to the loss of the Sierra Park Valley [Hetch Hetchy] it's hard to bear. The destruction of the charming groves and gardens, the finest in all California, goes to my heart."

In his life, Muir published six volumes of writings, all describing explorations of natural settings. Four additional books were published posthumously. Several books were subsequently published that collected essays and articles from various sources. Miller writes that what was most important about his writings was not their quantity, but their "quality". He notes that they have had a "lasting effect on American culture in helping to create the desire and will to protect and preserve wild and natural environments."

His first appearance in print was by accident, writes Miller; a person he did not know submitted, without his permission or awareness, a personal letter to his friend Jeanne Carr, describing Calypso borealis, a rare flower he had encountered. The piece was published anonymously, identified as having been written by an "inspired pilgrim". Throughout his many years as a nature writer, Muir frequently rewrote and expanded on earlier writings from his journals, as well as articles published in magazines. He often compiled and organized such earlier writings as collections of essays or included them as part of narrative books.

Muir's friendship with Jeanne Carr had a lifelong influence on his career as a naturalist and writer. They first met in the fall of 1860, when, at age 22, he entered a number of his homemade inventions in the Wisconsin State Agricultural Society Fair. Carr, a fair assistant, was asked by fair officials to review Muir's exhibits to see if they had merit. She thought they did and "saw in his entries evidence of genius worthy of special recognition," notes Miller. As a result, Muir received a diploma and a monetary award for his handmade clocks and thermometer. During the next three years while a student at the University of Wisconsin, he was befriended by Carr and her husband, Ezra, a professor at the same university. According to Muir biographer Bonnie Johanna Gisel, the Carrs recognized his "pure mind, unsophisticated nature, inherent curiosity, scholarly acumen, and independent thought." Jeanne Carr, 35 years of age, especially appreciated his youthful individuality, along with his acceptance of "religious truths" that were much like her own.

Muir was often invited to the Carrs' home; he shared Jeanne's love of plants. In 1864, he left Wisconsin to begin exploring the Canadian wilderness and, while there, began corresponding with her about his activities. Carr wrote Muir in return and encouraged him in his explorations and writings, eventually having an important influence over his personal goals. At one point she asked Muir to read a book she felt would be a valuable influence on his thinking, Lamartine's The Stonemason of Saint Point. It was the story of a man whose life she hoped would "metabolize in Muir," writes Gisel, and "was a projection of the life she envisioned for him." According to Gisel, the story was about a "poor man with a pure heart," who found in nature "divine lessons and saw all of God's creatures interconnected."

After Muir returned to the United States, he spent the next four years exploring Yosemite, while at the same time writing articles for publication. During those years, Muir and Carr continued corresponding. She sent many of her friends to Yosemite to meet Muir and "to hear him preach the gospel of the mountains," writes Gisel. The most notable was naturalist and author Ralph Waldo Emerson. The importance of Carr, who continually gave Muir reassurance and inspiration, "cannot be overestimated," adds Gisel. It was "through his letters to her that he developed a voice and purpose." She also tried to promote Muir's writings by submitting his letters to a monthly magazine for publication. Muir came to trust Carr as his "spiritual mother," and they remained friends for 30 years. In one letter she wrote to Muir while he was living in Yosemite, she tried to keep him from despairing as to his purpose in life:

I have often in my heart wondered what God was training you for. He gave you the eye within the eye, to see in all natural objects the realized ideas of His mind. He gave you pure tastes and the steady preference of whatsoever is most lovely and excellent. He has made you a more individualized existence than is common, and by your very nature and organization removed you from common temptations. . . . Dear friend, my recognition of you from the first was just this — "one of His beloved." When you are disposed to look hopelessly outward you may think, "Mrs. Carr believes fully in me. She would while there was enough left of my body to hold my soul." And you may think too that she does not pity half as much as she loves you.

The value of their friendship was first disclosed by a friend of Carr's, clergyman and writer G. Wharton James. After obtaining copies of their private letters from Carr, and despite pleadings from Muir to return them, he instead published articles about their friendship, using those letters as a primary source. In one such article, his focus was Muir's debt to Carr, stating that she was his "guiding star" who "led him into the noble paths of life, and then kept him there:"

We may beat about the bush all we will, but there is a spiritual potency in the love of a good, elderly woman for a young man that will stimulate him to his highest and best endeavors. Such was the relationship between these two, and John Muir is what he is today largely owing to the earlier impulses given to his soul by this highly intellectual and deeply spiritual woman.

Muir's friend, zoologist Henry Fairfield Osborn, writes that Muir’s style of writing did not come to him easily, but only with intense effort. "Daily he rose at 4:30 o’clock, and after a simple cup of coffee labored incessantly . . . . he groans over his labors, he writes and rewrites and interpolates." Osborn notes that he preferred using the simplest English language, and therefore admired above all the writings of Carlyle, Emerson and Thoreau. "He is a very firm believer in Thoreau and starts by reading deeply of this author." His secretary, Marion Randall Parsons, also noted that "composition was always slow and laborious for him. . . . Each sentence, each phrase, each word, underwent his critical scrutiny, not once but twenty times before he was satisfied to let it stand." Muir would often say to her, "This business of writing books is a long, tiresome, endless job."

Miller speculates that Muir recycled his earlier writings partly due to his "dislike of the writing process." He adds that Muir "did not enjoy the work, finding it difficult and tedious." He was generally unsatisfied with the finished result, finding prose "a weak instrument for the reality he wished to convey." However, he was prodded by friends and his wife to keep writing and as a result of their influence he kept at it, although never satisfied. Muir wrote in 1872, "No amount of word making will ever make a single soul to 'know' these mountains. One day's exposure to mountains is better than a cartload of books." In one of his essays, he gave an example of the deficiencies of writing versus experiencing nature:

...a tourist's frightened rush and scramble through the woods yields far less than the hunter's wildest stories, while in writing we can do but little more than to give a few names, as they come to mind, — beaver, squirrel, coon, fox, marten, fisher, otter, ermine, wildcat, — only this instead of full descriptions of the bright - eyed furry throng, their snug home nests, their fears and fights and loves, how they get their food, rear their young, escape their enemies, and keep themselves warm and well and exquisitely clean through all the pitiless weather.

Muir understood that if he hoped to discover truth, he had to turn to what he believed to be the most accurate sources. In his book, The Story of My Boyhood and Youth (1913), he writes that during his childhood, his father made him read the Bible every day. Muir eventually memorized three quarters of the Old Testament and all of the New Testament. Historian Dennis Williams adds that his father had read Josephus's War of the Jews in order to understand the culture of first century Palestine, as it was written by an eyewitness, and illuminated the culture during the period of the New Testament. But as Muir became attached to the American natural landscapes he explored, Williams notes that he began to see another "primary source for understanding God: the Book of Nature." According to Williams, in nature, especially in the wilderness, Muir was able to study the plants and animals in an environment that he believed "came straight from the hand of God, uncorrupted by civilization and domestication." As Tallmadge notes, Muir's belief in this "Book of Nature" compelled him to tell the story of "this creation in words any reader could understand." As a result, his writings were to become "prophecy, for [they] sought to change our angle of vision."

Williams notes that Muir's philosophy and world view rotated around his perceived dichotomy between civilization and nature. From this developed his core belief that "wild is superior". His nature writings became a "synthesis of natural theology" with scripture that helped him understand the origins of the natural world. According to Williams, philosophers and theologians such as Thomas Dick suggested that the "best place to discover the true attributes of deity was in Nature." He came to believe that God was always active in the creation of life and thereby kept the natural order of the world. As a result, Muir "styled himself as a John the Baptist," adds Williams, "whose duty was to immerse in 'mountain baptism' everyone he could." Williams concludes that Muir saw nature as a great teacher, "revealing the mind of God," and this belief became the central theme of his later journeys and the "subtext" of his nature writing.

During his career as writer and while living in the mountains, Muir continued to experience the "presence of the divine in nature," writes Holmes. From Travels in Alaska: "Every particle of rock or water or air has God by its side leading it the way it should go; The clearest way into the Universe is through a forest wilderness; In God's wildness is the hope of the world." His personal letters also conveyed these feelings of ecstasy. Historian Catherine Albanese stated that in one of his letters, "Muir's eucharist made Thoreau's feast on wood - chuck and huckleberry seem almost anemic." Muir was extremely fond of Thoreau and was probably influenced more by him than even Emerson. Muir often referred to himself as a "disciple" of Thoreau. She added that "Muir had successfully taken biblical language and inverted it to proclaim the passion of attachment, not to a supernatural world but to a natural one. To go to the mountains and sequoia forests, for Muir, was to engage in religious worship of utter seriousness and dedication." She quotes Muir's letter: Do behold the King in his glory, King Sequoia. Behold! Behold! seems all I can say. Some time ago I left all for Sequoia: have been and am at his feet fasting and praying for light, for is he not the greatest light in the woods; in the world.

During his first summer in the Sierra as a shepherd, Muir wrote field notes that emphasized the role that the senses play in human perceptions of the environment. According to Williams, he speculated that the world was an unchanging entity that was interpreted by the brain through the senses, and, writes Muir, "If the creator were to bestow a new set of senses upon us . . . we would never doubt that we were in another world. . . " While doing his studies of nature, he would try to remember everything he observed as if his senses were recording the impressions, until he could write them in his journal. As a result of his intense desire to remember facts, he filled his field journals with notes on precipitation, temperature, and even cloud formations.

However, Muir took his journal entries further than recording factual observations. Williams notes that the observations he recorded amounted to a description of "the sublimity of Nature," and what amounted to "an aesthetic and spiritual notebook." Muir felt that his task was more than just recording "phenomena," but also to "illuminate the spiritual implications of those phenomena," writes Williams. For Muir, mountain skies, for example, seemed to be painted with light, and came to "symbolize divinity." He would often describe his observations in terms of light:

". . . . so gloriously colored, and so luminous, . . . awakening and warming all the mighty host to do gladly their shining day’s work... to whose light everything seems equally divine, opening a thousand windows to show us God."

Muir biographer Steven Holmes notes that Muir used words like "glory" and "glorious" to suggest that light was taking on a religious dimension: "It is impossible to overestimate the importance of the notion of glory in Muir's published writings, where no other single image carries more emotional or religious weight," adding that his words "exactly parallels its Hebraic origins," in which biblical writings often indicate a divine presence with light, as in the burning bush or pillar of fire, and described as "the glory of God." Muir writes:

I do not understand the request of Moses, 'Show me thy glory,' but if he were here . . . after allowing him time to drink the glories of flower, mountain, and sky I would ask him how they compared with those of the Valley of the Nile . . . and I would inquire how he had the conscience to ask for more glory when such oceans and atmospheres were about him. King David was a better observer: 'The whole earth is full of thy glory.'

Muir would often use the term "home" as a metaphor for both nature and his general attitude toward the "natural world itself," notes Holmes. He would often use domestic language to describe his scientific observations, as when he saw nature as providing a home for even the smallest plant life: "the little purple plant, tended by its Maker, closed its petals, crouched low in its crevice of a home, and enjoyed the storm in safety." Muir also saw nature as his own home, as when he wrote friends and described the Sierra as "God's mountain mansion." He considered not only the mountains as home, however, as he also felt a closeness even to the smallest objects: "The very stones seem talkative, sympathetic, brotherly. No wonder when we consider that we all have the same Father and Mother."

In his later years, he would use the metaphor of nature as home in his writings to promote wilderness preservation. In one of his essays aimed at the common person he wrote, "Thousands of tired, nerve shaken, over civilized people are beginning to find out that going to the mountains is going home; that wilderness is a necessity; and that mountain parks and reservations are useful not only as fountains of timber and irrigating rivers, but as fountains of life."

Not surprisingly, Muir's deep seeted feeling about nature as being his true home led to tension with his family at his home in Martinez, California. He once told a visitor to his ranch there, "This is a good place to be housed in during stormy weather, . . . to write in, and to raise children in, but it is not my home. Up there," pointing towards the Sierra Nevada, "is my home."

In 1878, nearing the age of 40, Muir’s friends "pressured him to return to society." Soon after he returned to the Oakland area, he met Louisa Strentzel, daughter of a prominent physician and horticulturist with a 2,600 acre (11 km²) fruit orchard in Martinez, California, northeast of Oakland. In 1880, Muir and Strentzel married. Although Muir was a loyal, dedicated husband, and father of two daughters, "his heart remained wild," writes Marquis. His wife understood his needs and after seeing his restlessness at the ranch, would sometimes "shoo him back up" to the mountains. He sometimes took his daughters with him. The house and part of the ranch are now a National Historical Site.

John Muir died at California Hospital (now California Hospital Medical Center) in Los Angeles on 24 December 1914 of pneumonia at age 76, after a brief visit to Daggett, California, to see his daughter Helen Muir Funk.

During his lifetime John Muir published over 300 articles and 12 books. He co-founded the Sierra Club which helped establish a number of national parks after he died, and today has over 1.3 million members. Muir has been called the "patron saint of the American wilderness" and its "archetypal free spirit." Author Gretel Ehrlich states that as a "dreamer and activist, his eloquent words changed the way Americans saw their mountains, forests, seashores, and deserts." He not only led the efforts to protect forest areas and have some designated as national parks, but his writings gave readers a conception of the relationship between "human culture and wild nature as one of humility and respect for all life," writes author Thurman Wilkins.

His philosophy exalted wild nature over human culture and civilization, believing that all life was sacred. Turner describes him as "a man who in his singular way rediscovered America. . . . an American pioneer, an American hero." Wilkins adds that a primary aim of Muir’s nature philosophy was to challenge mankind’s "enormous conceit," and in so doing, he moved beyond the Transcendentalism of Emerson to a "biocentric perspective on the world." He did so by describing the natural world as "a conductor of divinity," and his writings often made nature synonymous with God. His friend Henry Fairfield Osborn noted that he retained from his early religious training under his father "this belief, which is so strongly expressed in the Old Testament, that all the works of nature are directly the work of God."

In the months after his death, many who knew Muir closely wrote about his influences: Robert Underwood Johnson, editor of Century Magazine which published many of his articles, wrote that "the world will look back to the time we live in and remember the voice of one crying in the wilderness and bless the name of John Muir. . . . He sung the glory of nature like another Psalmist, and, as a true artist, was unashamed of his emotions." He added, "His countrymen owe him gratitude as the pioneer of our system of national parks. . . . Muir’s writings and enthusiasm were the chief forces that inspired the movement. All the other torches were lighted from his."

California celebrates John Muir Day on April 21 each year. Muir was the first person to be honored with a California commemorative day when the legislation was signed in 1988 to create John Muir Day effective from 1989 onwards; Muir is one of three people so honored in California, as Harvey Milk Day and Ronald Reagan Day would be signed into law in 2009 and 2010, respectively.

The following places were named after Muir: Muir Knoll, University of Wisconsin – Madison, Mount Muir, Muir Glacier, Alaska, Three John Muir Trails (in California, Tennessee, and Wisconsin), John Muir Wilderness (southern and central Sierra Nevada, California), Muir Woods National Monument just north of San Francisco, Muir Beach, California, John Muir National Historic Site in Martinez, California, John Muir High School (Pasadena, California), John Muir Middle School (Los Angeles, California, San Jose, California, San Leandro, California, and Wausau, Wisconsin), Muirlands Middle School (La Jolla, California), John Muir Elementary School (Martinez, California; Antioch, California; Merced, California; Modesto, California; San Bruno, California; Santa Monica, California; Stockton, California; Hoffman Estates, Illinois; Parma, Ohio; Kirkland, Washington; Madison, Wisconsin; and Portage, Wisconsin), John Muir College (a residential college of the University of California, San Diego), John Muir Country Park, in Dunbar; the John Muir Way in East Lothian, John Muir Medical Center in Brentwood, Concord, and Walnut Creek, California, The main-belt asteroid 128523 Johnmuir, Muir's Peak next to Mount Shasta, California (also known as Black Butte), Mount Muir (elevation 4688') in Angeles National Forest, California, north of Pasadena, Camp Muir in Mount Rainier National Park, School of Life Sciences building at Heriot - Watt University in Edinburgh, Scotland, John Muir Park (Green Bay, Wisconsin), A section of California State Route 132 between Coulterville and Smith Station at California State Route 120 has been designated the John Muir Highway. This road roughly follows part of the route Muir took on his first walk to Yosemite.

John Muir was featured on two U.S. commemorative postage stamps. A 5 cent stamp issued on April 29, 1964 was designed by Rudolph Wendelin, and showed Muir's face superimposed on a grove of redwood trees, and the inscription, "John Muir Conservationist". A 32 cent stamp issued on February 3, 1998 was part of the "Celebrate the Century" series, and showed Muir in Yosemite Valley, with the inscription "John Muir, Preservationist". An image of Muir, with the California Condor and Half Dome, appears on the California state quarter which was released in 2005. A quotation of his appears on the reverse side of the Indianapolis Prize Lilly Medal for conservation. On December 6, 2006, California Governor Arnold Schwarzenegger and First Lady Maria Shriver inducted John Muir into the California Hall of Fame located at The California Museum for History, Women, and the Arts.

Muir and Hudson Stuck are honored with a feast day on the liturgical of the Episcopal Church in the United States of America on April 22.

Muirite (a mineral), Erigeron muirii, Carlquistia muirii (two species of aster), Ivesia muirii (a member of the rose family), Troglodytes troglodytes muiri (a type of wren), Ochotona princeps muirii (a subspecies of alpine rabbit), Thecla muirii (a butterfly), and Amplaria muiri (a millipede) were all named after John Muir.