It is only through imagination that men become aware of what the world might be; without it, ‘progress’ would become mechanical and trivial.

A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.

Herd pressure is to be judged by two things: first, its intensity, and second, its direction.

As a lover of truth, the national propaganda of all the belligerent nations sickened me. As a lover of civilization, the return to barbarism appalled me.

To avoid the various foolish opinions to which mankind are prone, no superhuman genius is required. A few simple rules will keep you, not from all error, but from silly error.

Extreme hopes are born of extreme misery, and in such a world hopes could only be irrational.

To the primitive mind, everything is either friendly or hostile; but experience has shown that friendliness and hostility are not the conceptions by which the world is to be understood.