There may sometimes be ungenerous attempts to keep a young man down; and they will succeed too, if he allows his mind to be diverted from its true channel to brood over the attempted injury. Cast about, and see if this feeling has not injured every person you have ever known to fall into it.
Abraham Lincoln: Speeches & Writings Part 1: 1832-1858: Library of America #45 (ed. Library of America, 1989) - ISBN: 9781598531206