My favorites,
"Today we say that Greeks fight like heroes, from now on we will say that heroes fight like Greeks."
Prime Minister Winston Churchill
"You have enemies? Good. That means you've stood up for something, sometime in your life."
Winston Churchill
"It concerns us to know the purpose we seek in life, for then, like archers aiming at a definitive mark, we shall be more likely to attain what we want." -Aristotle
"If you live according to nature, you will never be poor; but if according to opinions, you will never be rich. Nature demands little, opinion a great deal." - Epicurus