There two things that are infinite, human stupidity and the universe, I don't know about the universe

To a student: Dear Miss - I have read about sixteen pages of your manuscript . . . I suffered exactly the same treatment at the hands of my teachers who disliked me for my independence and passed over me when they wanted assistants. . . . Keep your manuscript for your sons and daughters, in order that they may derive consolation from it and not give a damn for what their teachers tell them or think of them. . . . There is too much education altogether.

I have become rather like King Midas, except that everything turns not into gold but into a circus.

If you have never failed, you have never tried anything new.

The ideals which have always shone before me and filled me with the joy of living are goodness, beauty, and truth.

Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.

You ask me if I keep a notebook to record my great ideas. I've only ever had one.