A few great minds are enough to endow humanity with monstrous power, but a few great hearts are not enough to make us worthy of using it.

A man is not old as long as he is seeking something.

Certain brief sentences are peerless in their ability to give one the feeling that nothing remains to be said.

Kill a man, and you are an assassin. Kill millions of men, and you are a conqueror. Kill everyone, and you are a god.

Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god.

My pessimism extends to the point of even suspecting the sincerity of the pessimists.

Never feel remorse for what you have thought about your wife; she has thought much worse things about you.

Science has made us gods even before we are worthy of being men.

The only things one can admire at length are those one admires without knowing why.

There are certain moments when we might wish the future were built by men of the past.