"How prone to doubt, how cautious are the wise!"
"The unexamined life is not worth living."
"The man of wisdom is never of two minds;the man of benevolence never worries;the man of courage is never afraid."
"Turn your wounds into wisdom."
"In a good bookroom you feel in some mysterious way that you are absorbing the wisdom contained in all the books through your skin, without even opening them."
"As if you could kill time without injuring eternity."
"It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it."
"The older I grow, the more I distrust the familiar doctrine that age brings wisdom."
"It is the mark of an educated mind to be able to entertain a thought without accepting it."
"The road of excess leads to the palace of wisdom."
"A man should never be ashamed to own that he has been in the wrong, which is but saying in other words that he is wiser today than he was yesterday."
"The fool doth think he is wise, but the wise man knows himself to be a fool."