What does Emerson mean by self-reliance?

Emerson opens his essay with the assertion, "To believe in your own thought, to believe that what is true for you in your private heart is true for all men, - that is genius." His statement captures the essence of what he means by "self-reliance," namely the reliance upon one's own thoughts and ideas. He argues individuals, like Moses, Plato, and Milton, are held in the highest regard because they spoke what they thought. They did not rely on the words of others, books, or tradition. Unfortunately, few people today do so; instead, "he dismisses without notice his thought, because it is his."