We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.

All theoretical chemistry is really physics; and all theoretical chemists know it.

If you know that you are not sure, you have a chance to improve the situation. I want to demand this freedom for future generations.

One of the ways of stopping science would be only to do experiments in the region where you know the law. But experimenters search most diligently, and with the greatest effort, in exactly those places where it seems most likely that we can prove our theories wrong. In other words, we are trying to prove ourselves wrong as quickly as possible, because only in that way can we find progress.

Nature...cannot be fooled!

You can always recognize truth by its beauty and simplicity.

The "paradox" is only a conflict between reality and your feeling of what reality "ought to be."