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

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

I find that teaching and the students keep life going, and I would never accept any position in which somebody has invented a happy situation for me where I don't have to teach. Never.

The female mind is capable of understanding analytic geometry... The difficulty may just be that we have never yet discovered a way to communicate with the female mind. If it is done in the right way, you may be able to get something out of it.

If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives.

Philosophers say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong.

I think a power to do something is of value. Whether the result is a good thing or a bad thing depends on how it is used, but the power is a value.