I have reached the conviction that the abolition of the death penalty is desirable. Reasons: 1) Irreparability in the event of an error of justice, 2) Detrimental moral influence of the execution procedure on those who, whether directly or indirectly, have to do with the procedure.

Man usually avoids attributing cleverness to somebody else unless it is an enemy.

There is no logical way to the discovery of these elemental laws. There is only the way of intuition, which is helped by a feeling for the order lying behind the appearance.

If [quantum theory] is correct, it signifies the end of physics as a science.

To know what is impenetrable to us really exists, manifesting itself as the highest wisdom and the most radiant beauty... this knowledge, this feeling is at the center of true religiousness.

I became more and more convinced that even nature could be understood as a relatively simple mathematical structure.

Life is like riding a bicycle. If you want to stay balanced you've got to keep moving forward.