There is something in the human spirit that will survive and prevail, there is a tiny and brilliant light burning in the heart of man that will not go out no matter how dark the world becomes.

Pierre was one of those people who are strong only when they feel themselves perfectly pure.

The changes in our life must come from the impossibility to live otherwise than according to the demands of our conscience not from our mental resolution to try a new form of life.

Man discovers truth by reason only, not by faith.

We shall all of us die, so why should I grudge a little trouble?

Mathematics is the queen of disciplines.... it will drive the nonsense out of your head!

What is bad? What is good? What should one love, what hate? Why live, and what am I? What is lie,what is death? What power rules over everything?" he asked himself. And there was no answer to any of these questions except one, which was not logical and was not at all an answer to these questions. This answer was: "You will die--and everything will end. You will die and learn everything--or stop asking.