Anybody who is not shocked by this subject has failed to understand it. [of quantum mechanics]

In the great drama of existence we are audience and actors at the same time.

Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.

Truth and clarity are complementary.

There are two sorts of truth: trivialities, where opposites are clearly absurd, and profound truths, recognised by the fact that the opposite is also a profound truth

It is the hallmark of any deep truth that its negation is also a deep truth.

The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.