I have always loved solitude, a trait which tends to increase with age.

The whole of science is nothing more than a refinement of everyday thinking.

A scientist is a mimosa when he himself has made a mistake, and a roaring lion when he discovers a mistake of others.

The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.

This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

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.

In living through this great epoch, it is difficult to reconcile oneself to the fact that one belongs to that mad, degenerate species that boasts of its free will. How I wish that somewhere there existed an island for those who are wise and of good will. In such a place even I should be an ardent patriot!