It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.

[B]eyond poverty, beyond the point that the material needs are reasonably satisfied, only from within is peace.

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.

There was a time when the newspapers said that only twelve men understood the theory of relativity. I do not believe there ever was such a time ... On the other hand, I think I can safely say that nobody understands quantum mechanics.

If you think you understand quantum mechanics, you don't understand quantum mechanics.

If all of mathematics disappeared, physics would be set back by exactly one week.

But there is nothing in biology yet found that indicates the inevitability of death.