Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.

Do you remember how electrical currents and 'unseen waves' were laughed at? The knowledge about man is still in its infancy.

The man who regards his own life and that of his fellow-creatures as meaningless is not merely unfortunate but almost disqualified for life.

When men are engaged in war and conquest, the tools of science become as dangerous as a razor in the hands of a child of three. We must not condemn man because his inventiveness and patient conquest of the forces of nature are being exploited for false and destructive purposes. Rather, we should remember that the fate of mankind hinges entirely upon man’s moral development.

The only source of knowledge is experience.

We can understand almost anything, but we can't understand how we understand.

Just as with the man in the fairy tale who turned whatever he touched into gold, with me everything is turned into newspaper clamor.