It is true that the grasping of truth is not possible without empirical basis. However, the deeper we penetrate and the more extensive and embracing our theories become the less empirical knowledge is needed to determine those theories.

I am an absolute pacifist...It is an instinctive feeling. It is a feeling that possesses me, because the murder of men is disgusting.

The height of stupidity is most clearly demonstrated by the individual who ridicules something he knows nothing about.

This is too difficult for a mathematician. It takes a philosopher. The hardest thing in the world to understand is the income tax.

My position concerning God is that of an agnostic. I am convinced that a vivid consciousness of the primary importance of moral principles for the betterment and ennoblement of life does not need the idea of a law-giver, especially a law-giver who works on the basis of reward and punishment.

It is my inner conviction that the development of science seeks in the main to satisfy the longing for pure knowledge.

While it is true that an inherently free and scrupulous person may be destroyed, such an individual can never be enslaved or used as a blind tool.