There are big and little truths, but all belong to the same race.

The divine is perhaps that quality in man which permits him to endure the lack of God.

It is sometimes important for science to know how to forget the things she is surest of.

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

We must watch over our modesty in the presence of those who cannot understand its grounds.

Kill one man and you're a murderer, kill a million and you're a conqueror.

It is not easy to imagine how little interested a scientist usually is in the work of any other, with the possible exception of the teacher who backs him or the student who honors him.