When it is said that an object occupies a large space in the soul or even that it fills it entirely, we ought to understand by this simply that its image has altered the shade of a thousand perceptions or memories, and that in this sense it pervades them, although it does not itself come into view.

It is the very essence of intelligence to coordinate means with a view to a remote end, and to undertake what it does not feel absolutely sure of carrying out.

The movement of the stream is distinct from the river bed, although it must adopt its winding course.

Europe is overpopulated, the world will soon be in the same condition, and if the self-reproduction of man is not rationalized... we shall have war.

In reality, the past is preserved by itself automatically.

Sex-appeal is the keynote of our whole civilization.

To perceive means to immobilize. To say this is to say that we seize, in the act of perception, something which outruns perception itself.