Transcendentalism was a 19th century philosophical movement that believed true reality exists beyond the physical world. Transcendentalists saw God and the spiritual world reflected in nature and humanity. They believed intuition was superior to reason, and that individuals were their own authority rather than society or religion. Major transcendentalist writers included Ralph Waldo Emerson and Henry David Thoreau, who took ideas from transcendentalist roots in idealism, puritanism, and romanticism to develop these beliefs and pursue social reform.