Ralph Waldo Emerson
The original American transcendentalist — and the writer who gave a generation permission to trust themselves over institutions, traditions, and received opinion.
Ralph Waldo Emerson was born in Boston in 1803, trained as a minister, and resigned his pulpit in 1832 because he couldn't in good conscience administer communion. That act of intellectual honesty set the tone for everything that followed. His 1841 essay Self-Reliance is one of the most quoted documents in American culture — a sustained argument that conformity is a slow death, and that what you know in your own quiet moments is more reliable than what society tells you to believe.
Emerson was also a tireless lecturer, a generous mentor to Thoreau and Whitman, and a serious opponent of slavery at a time when many of his peers found the question inconvenient. His central conviction — that something worth listening to runs through every individual — has aged better than most philosophical positions of his era.