Socrates

“Be kind, for everyone you meet is fighting a hard battle.”

“The unexamined life is not worth living.”

“I know that I know nothing.”

“The only true wisdom is in knowing you know nothing.”

“To find yourself, think for yourself.”

“Strong minds discuss ideas, average minds discuss events, weak minds discuss people.”

“Education is the kindling of a flame, not the filling of a vessel.”

“Wonder is the beginning of wisdom.”

“I know that I am intelligent, because I know that I know nothing.”

“The secret of happiness is not found in seeking more, but in developing the capacity to enjoy less.”

“Let him who would move the world first move himself.”

“There is only one good, knowledge, and one evil, ignorance.”

“He is richest who is content with the least, for contentment is the wealth of nature.”

“By all means marry; if you get a good wife, you'll become happy; if you get a bad one, you'll become a philosopher.”