"I have gained nothing by not living quietly, and I have not gained anything that is worthy of the name of gain."

"As for me, all I know is that I know nothing, for when I think I know something, I discover that I had no idea about it."

"There is only one good, knowledge, and one evil, ignorance."

"No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable."

"Do not do to others what angers you if done to you by others."