The more I learn, the more I realize I don't know.

I am a deeply religious nonbeliever - this is a somewhat new kind of religion.

In conclusion I wish to say that in working at the problem here dealt with I have had the loyal assistance of my friend and colleague M. Besso, and that I am indebted to him for several valuable suggestions.

The State is made for Mankind, not mankind for the state

Intelligent life on other planets? I'm not even sure there is on earth!

My comprehension of God comes from a deeply felt conviction of a superior intelligence that reveals itself in the knowable world.

Love is not the stupidest thing a man does, but it cannot be blamed on gravity.