It is a miracle that curiosity survives formal education.

People should be more like animals . . . they should be more intuitive; they should not be too conscious of what they do while they do it.

How insidious Nature is when one is trying to get at it experimentally.

My pacifism is not based on any intellectual theory but on a deep antipathy to every form of cruelty and hatred.

The time comes in life when we have read enough. It's time to stop reading. It's time to lay down the books and write.

It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing...

God always takes the simplest way.