I think I can safely say that nobody understands Quantum Mechanics.

From a long view of the history of mankind, seen from, say, ten thousand years from now, there can be little doubt that the most significant event of the 19th century will be judged as Maxwell's discovery of the laws of electrodynamics. The American Civil War will pale into provincial insignificance in comparison with this important scientific event of the same decade.

The problem of creating something new, but which is consistent with everything which has been seen before, is one of extreme difficulty.

To test whether you have learned an idea or a definition, rephrase what you just learned without using the new word.

One does not, by knowing all the physical laws as we know them today, immediately obtain an understanding of anything much. I love only nature, and I hate mathematicians.

I think Nature's imagination is so much greater than man's, she's never gonna let us relax!

We scientists are clever — too clever — are you not satisfied? Is four square miles in one bomb not enough? Men are still thinking. Just tell us how big you want it!