The observer, when he seems to himself to be observing a stone, is really, if physics is to be believed, observing the effects of the stone upon himself.

The great majority of men and women, in ordinary times, pass through life without ever contemplating or criticising, as a whole, either their own conditions or those of the world at large.

The most savage controversies are about matters as to which there is no good evidence either way.

A happy life must be to a great extent a quiet life, for it is only in an atmosphere of quiet that true joy dare live.

Too little liberty brings stagnation, and too much brings chaos.

... the whole world of loneliness, poverty, and pain make a mockery of what human life should be.

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.