The first virtue of all really great men is that they are sincere

War will disappear only when men shall take no part whatever in violence and shall be ready to suffer every persecution that their abstention will bring them. It is the only way to abolish war.

The greatest virtue of man is perhaps curiosity.

It is the certainty that they possess the truth that makes men cruel.

He despises men with tenderness

Never lend books, for no one ever returns them; the only books I have in my library are books that other folks have lent to me