What I seek to accomplish is simply to serve with my feeble capacity truth and justice, at the risk of pleasing no one.

I owe as much of my success to an uncompromising obstinacy as to any original ideas.

It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. I do not believe in a personal God and I have never denied this but have expressed it clearly. If something is in me which can be called religious then it is the unbounded admiration for the structure of the world so far as our science can reveal it.

Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty.

War cannot be humanized. It can only be abolished.

Not all things worth counting are countable and not all things that count are worth counting.

When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.