What Mach calls a thought experiment is of course not an experiment at all. At bottom it is a grammatical investigation.

Thing, body, matter, are nothing apart from the combinations of the elements, - the colours, sounds, and so forth - nothing apart from their so-called attributes.

A colour is a physical object as soon as we consider its dependence, for instance, upon its luminous source, upon other colours, upon temperatures, upon spaces, and so forth.

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.

Science is the most complete presentment of facts with the least expenditure of thought

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.

Many an article that I myself penned twenty years ago impresses me now as something quite foreign to myself.

Science always has its origin in the adaptation of thought to some definite field of experience.

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

If our dreams were more regular, more connected, more stable, they would also have more practical importance for us.

Guard well your thoughts when alone and your words when accompanied.

Death and life are the same thing-like the two sides of my hand, the palm and the back. And still the palm and the back are not the same...They can be neither separated, nor mixed.

How could we have been afraid of her? She was only dead. It’s the living we fear.

Beware the hobby that eats.

Mechanical rules are never a substitute for clarity of thought.

A man who loves his wife will love her letters and her photographs because they speak to him of her. So if we love the Lord Jesus, we shall love the Bible because it speaks to us of him.

I talk to myself everyone once in a while. Give myself very good advice. Sometimes I even take it.

See all these buildings, Russell? All these buildings were once a drawing on a piece of paper, and before that they were an idea in someone’s head. Any idea that you have, you can make manifest.

None of my songs are written 'about' someone or something, they all just sort of tumble out unannounced, like the worst kind of house guest.

Ending racial discrimination in jury selection can be accomplished only by eliminating peremptory challenges entirely.