I recently discussed with an intelligent and well-disposed man the threat of another war, which in my opinion would seriously endanger the existence of mankind, and I remarked that only a supranational organization would offer protection from that danger. Thereupon my visitor, very calmly and coolly, said to me: "Why are you so deeply opposed to the disappearance of the human race?".

Thinking is hard work; that's why so few do it.

A man must learn to understand the motives of human beings, their illusions, and their sufferings.

Education is what remains after one has forgotten what one has learned in school.

I cannot then believe in this concept of an anthropomorphic God who has the powers of interfering with these natural laws. As I said before, the most beautiful and most profound religious emotion that we can experience is the sensation of the mystical. And this mysticality is the power of all true science.

Scientists were rated as great heretics by the church, but they were truly religious men because of their faith in the orderliness of the universe.

For the most part, I do the thing which my own nature prompts me to do. It is embarrassing to earn so much respect and love for it.