True wisdom comes to each of us when we realize how little we understand about life, ourselves, and the world around us.

I am the wisest man alive, for I know one thing, and that is that I know nothing.

One who is injured ought not to return the injury, for on no account can it be right to do an injustice; and it is not right to return an injury, or to do evil to any man, however much we have suffered from him.

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

It is not living that matters, but living rightly.