"Life belongs to the living, and he who lives must be prepared for changes."

"The greatest evil that can befall man is that he should come to think ill of himself."

"Man is not born to solve the problems of the universe, but to find out what he has to do in order to limit himself to the limits of his comprehension."

"To say something is true is not enough; one must also live it."

"A man's manners are a mirror in which he shows his portrait."