Think? Why think! We have computers to do that for us.

When I was young I pitied the old. Now old, it is the young I pity.

What scientist would not long to go on living, if only to see how the little truths he has brought to light will grow up?

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.

To reflect is to disturb one's thoughts.

The books one has written in the past have two surprises in store: one couldn't write them again, and wouldn't want to.

Truth is always served by great minds, even if they fight it.