The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

Whatever your problems in math are, I assure mine are greater.

The goal of pacifism is possible only though a supranational organization. To stand unconditionally for this cause is the criterion of true pacifism.

I have always disliked the fierce competitive spirit embodied in that highly intellectual game.

The true sign of intelligence is not knowledge but imagination.

The most fundamental question we can ever ask ourselves is whether or not the universe we live in is friendly or hostile.

Since that deluge of newspaper articles I have been so flooded with questions, invitations, suggestions, that I keep dreaming I am roasting in Hell, and the mailman is the devil eternally yelling at me, showering me with more bundles of letters at my head because I have not answered the old ones.