“A true philosopher must never give up.”

“...these sleepless nights, when oddly enough my concentration was high, fueled perhaps by the effort to ignore the all-engrossing threat of bombs and rockets.”

“Never, never, never give in!”

“The fool doth think he is wise, but the wise man knows himself to be a fool.”

“The secret of life, though, is to fall seven times and to get up eight times.”

“It is the mark of an educated mind to be able to entertain a thought without accepting it.”