Plato on Socrates' trial: "The unexamined life is not worth living."

Oscar Wilde: "Be yourself; everyone else is already taken."

The eminently quotable Winston Churchill: "You have enemies? Good. That means you've stood up for something, sometime in your life."

Churchill again: “I never worry about action, but only inaction.”

ETA: That's signature worthy.

What is to give light must endure burning.