Everything is energy and that’s all there is to it.

There are two different conceptions about the nature of the universe: (1) the world as a unity dependent on humanity; (2) the world as a reality independent of the human factor.

We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.

Gravity is a response to geometry.

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

Beyond the realms of what we see, into the regions or the unexplored limited only by our imaginations.

There comes a point in your life when you need to stop reading other people's books and write your own.