Socrates

"The unexamined life is not worth living."

"I only know that I know nothing"

"Wonder is the beginning of wisdom."

"The only true wisdom is in knowing you know nothing."

"Know thyself."

"My advice to you is get married: if you find a good wife you'll be happy; if not, you'll become a philosopher."

"Be of good cheer about death, and know this of a truth, that no evil can happen to a good man, either in life or after death."

"The greatest blessing granted to mankind come by way of madness, which is a divine gift."

"Be slow to fall into friendship; but when thou art in, continue firm and constant."

"Be slow to fall into friendship; but when thou art in, continue firm and constant."