Strange as it may sound, the power of mathematics rests on its evasion of all unnecessary thought and on its wonderful saving of mental operations.

Physics is experience, arranged in economical order.

Ordinarily pleasure and pain are regarded as different from sensations.

Bodies do not produce sensations, but complexes of elements (complexes of sensations) make up bodies.

To us investigators, the concept 'soul' is irrelevant and a matter for laughter. But matter is an abstraction of exactly the same kind, just as good and just as bad as it is. We know as much about the soul as we do of matter.

I can accept the theory of relativity as little as I can accept the existence of atoms and other such dogmas.

Man is pre-eminently endowed with the power of voluntarily and consciously determining his own point of view.