“A man should never be ashamed to own he has been in the wrong, which is but saying, in other words, that he is wiser today than he was yesterday.”

“I do not think much of a man who is not wiser today than he was yesterday.”

“Senator Douglas holds, we know, that a man may rightfully be wiser today than he was yesterday — that he may rightfully change when he finds himself wrong. But can we, for that reason, run ahead, and infer that he will make any particular change, of which he, himself, has given no intimation?”

“Wisely humble people are never afraid to admit they were wrong. When they do it, it’s like saying they’re wiser today than they were yesterday.”

“He that never changes his opinions, never corrects his mistakes, and will never be wiser on the morrow than he is today.”

“As the traveler who has once been from home is wiser than he who has never left his own doorstep, so a knowledge of one other culture should sharpen our ability to scrutinize more steadily, to appreciate more lovingly, our own.”

“No wise man can have a contempt for the prejudices of others; and he should even stand in a certain awe of his own, as if they were aged parents and monitors. They may in the end prove wiser than he.”

“Someone will say: And are you not ashamed, Socrates, of a course of life which is likely to bring you to an untimely end? To him I may fairly answer: There you are mistaken: a man who is good for anything ought not to calculate the chance of living or dying; he ought only to consider whether in doing anything he is doing right or wrong — acting the part of a good man or a bad. …For wherever a man's place is, whether the place he has chosen or that where he has been placed by a commander. there he ought to remain in the hour of danger; he should not think of death or of anything, but of disgrace.”

“Nature has willed that man should, by himself, produce everything that goes beyond the mechanical ordering of his animal existence, and that he should partake of no other happiness or perfection than that which he himself, independently of instinct, has created by his own reason.”

“I'm like a starving man who has been given food. Maybe he's cold, and his clothes are torn, and he's ashamed, but he's not unhappy.”