It is very much easier to divide your outlook on the world into two halves, to say that you know this belongs to the daily half and this belongs to the Sunday half.

We gain our ends only with the laws of nature; we control her only by understanding her laws.

There is no absolute knowledge. And those who claim it, whether they are scientists or dogmatists, open the door to tragedy.

There are three creative ideas which, each in its turn, have been central to science. They are the idea of order, the idea of causes, and the idea of chance.

It doesn't matter whether you're talking about bombs or the intelligence quotients of one race as against another if a man is a scientist, like me, he'll always say Publish and be damned.

Nations in their great ages have not been great in art or science, but in art and science.

Every animal leaves traces of what it was; man alone leaves traces of what he created.