"Gratitude looks to the Past and love to the Present; fear, avarice, lust, and ambition look ahead."

"You must be asking which door is the true one; not which pleases you best."

"Education without values, as useful as it is, seems rather to make man a more clever devil."

"Friendship is unnecessary, like philosophy, like art. It has no survival value; rather it is one of those things which give value to survival."

"Love is never wasted, for its value does not rest upon reciprocity."

"You never know how much you really believe anything until its truth or falsehood becomes a matter of life and death to you."