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

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

The mathematician who pursues his studies without clear views of this matter, must often have the uncomfortable feeling that his paper and pencil surpass him in intelligence.

A movement that we will to execute is never more than a represented movement, and appears in a different domain from that of the executed movement, which always takes place when the image is vivid enough.

When I recall today my early youth, I should take the boy that I then was, with the exception of a few individual features, for a different person, were it not for the existence of the chain of memories.

Thought experiment is in any case a necessary precondition for physical experiment. Every experimenter and inventor must have the planned arrangement in his head before translating it into fact.

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