•Why it earns a slot
The founding text of American individualism, quoted (and misquoted) more than almost any other essay in the language, and the direct intellectual ancestor of everything from Thoreau's Walden to Silicon Valley's founder mythology.
Emerson's Self-Reliance argues that conformity is the great enemy of the soul: society is 'a joint-stock company' in which members trade their liberty for security, and genius is nothing more than trusting the thought that flashes across your own mind instead of waiting for someone else to say it first and admiring it only then.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.