Nobody knows how the stand of our knowledge about the atom would be without him. Personally, [Niels] Bohr is one of the amiable colleagues I have met. He utters his opinions like one perpetually groping and never like one who believes himself to be in possession of the truth.

Adversity introduces a man to himself.

Agreements about what is good or not, are usually not worth much. It is very much like art, is it not an art to lead a good life?

During the youthful period of mankind's spiritual evolution human fantasy created gods in man's own image, who, by the operations of their will were supposed to determine, or at any rate to influence, the phenomenal world. Man sought to alter the disposition of these gods in his own favour by means of magic and prayer.

The strongest force in the universe is Compound Interest.

When the solution is simple, God is answering.

Curiosity is its own reason.