"The key to living a moral life is this: Do nothing in private that you would be ashamed to discuss openly with your mother."

"When you have to deal with a man, you have to deal with him as he is, not as you would like him to be."

"The man who is not willing to change will never improve."

"The world is not governed by the laws of logic, but by the laws of human nature."

"The greatest good we can do for others is not just to share our riches with them, but to reveal to them their own."