"Sometimes you put walls up not to keep people out, but to see who cares enough to break them down."

"The only good is knowledge and the only evil is ignorance."

"Know thyself."

"Death may be the greatest of all human blessings."

"Let him who would move the world first move himself."

"Every action has its pleasures and its price."

"The way to gain a good reputation is to endeavor to be what you desire to appear."

"The secret of happiness, you see, is not found in seeking more, but in developing the capacity to enjoy less."

Contentment is natural wealth, luxury is artificial poverty."

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

"When the debate is lost, slander becomes the tool of the loser."

"I am not an Athenian nor a Greek, but a citizen of the world."