I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.

From the viewpoint of a Jesuit priest I am, of course, and have always been an atheist.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

Princeton is a wonderful little spot. A quaint and ceremonious village of puny demigods on stilts.

What is essential in the life of a man of my kind is what he thinks and how he thinks, and not what he does or suffers.

Make everything as simple as possible, but not simpler.

It is true that my parents were worried because I began to speak fairly late, so that they even consulted a doctor. I can't say how old I was - but surely not less than three.