In reality, the law always contains less than the fact itself, because it does not reproduce the fact as a whole but only in that aspect of it which is important for us, the rest being intentionally or from necessity omitted.

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

I once knew an otherwise excellent teacher who compelled his students to perform all their demonstrations with incorrect figures, on the theory that it was the logical connection of the concepts, not the figure, that was essential.

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.

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

Ordinarily pleasure and pain are regarded as different from sensations.

Personally, people know themselves very poorly.