Don't believe the results of experiments until they're confirmed by theory.

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

The physical world is entirely abstract and without actuality apart from its linkage to consciousness.

I believe there are 15, 747, 724, 136, 275, 002, 577, 605, 653, 961, 181, 555, 468, 044, 717, 914, 527, 116, 709, 366, 231, 425, 076, 185, 631, 031, 296 protons in the universe and the same number of electrons.

An ocean traveler has even more vividly the impression that the ocean is made of waves than that it is made of water.

Probably the simplest hypothesis... is that there may be a slow process of annihilation of matter.

For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.