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

The leader is one who, out of the clutter, brings simplicity... out of discord, harmony... and out of difficulty, opportunity.

This is a question too difficult for a mathematician. It should be asked of a philosopher"(when asked about completing his income tax form)

I am not more gifted than anybody else. I am just more curious than the average person and I will not give up a problem until I have found the proper solution.

My success wasn't so much due to intelligence, but the fact that I stuck with problems longer.

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

I once thought that if I could ask God one question, I would ask how the universe began, because once I knew that, all the rest is simply equations. But as I got older I became less concerned with how the universe began. Rather, I would want to know why he started the universe. For once I knew that answer, then I would know the purpose of my own life.