Mathematics is the most exact science, and its conclusions are capable of absolute proof. But this is so only because mathematics does not attempt to draw absolute conclusions. All mathematical truths are relative, conditional. In E. T. Bell Men of Mathematics, New York: Simona and Schuster, 1937.

No man really becomes a fool until he stops asking questions.

I have succeeded in getting my actual work down to thirty minutes a day. That leaves me eighteen hours for engineering.

The most important advance in the next fifty years will be in the realm of the spiritual - dealing with the spirit of thought.

Money is a stupid measure of achievement, but unfortunately it is the only universal measure we have.

No evidence or proof of the existence of a God has been found in the phenomena of nature, based on experience.

The scientist knows that the ultimate of everything is unknowable. No matter What subject you take, the current theory of it if carried to the ultimate becomes ridiculous. Time and space are excellent examples of this.