A great deal of talent is lost to the world for want of a little courage. Every day sends to their graves obscure men whose timidity prevented them from making a first effort.
Sydney Smith (1771-1845) English clergyman, essayist, wit
Elementary Sketches of Moral Philosophy, Lecture 9 “On the Conduct of Understanding” (1849)
(Source)
Based on a lecture in a series given at the Royal Institution (1804-1806).