"Man cannot live without a permanent belief in something indestructible in himself, though both the indestructible element and the belief may remain hidden from him."

"He who cannot give an account of three thousand years of history remains in darkness, inexperienced, and lives from day to day."

"I can promise to be sincere, but not to be impartial."

"Behavior is a mirror in which everyone displays his own image."

"The highest wisdom is to know that we know nothing."