“I learned this, at least, by my experiment: that if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.”
-- Henry David Thoreau, Walden
As quoted in an interesting article about changing the words of famous people so their inspirations are pithier and more exclamitory. Above is the real line, as written by Thoreau in Walden. No exclamation points needed.