When the labourer co-operates systematically with others, he strips off the fetters of his individuality, and develops the capabilities of his species.

The country that is more developed industrially only shows, to the less developed, the image of its own future.

The development of civilization and industry in general has always shown itself so active in the destruction of forests that everything that has been done for their conservation and production is completely insignificant in comparison.

Political economy regards the proletarian like a horse, he must receive enough to enable him to work. It does not consider him, during the time when he is not working, as a human being. It leaves this to criminal law, doctors, religion, statistical tables, politics, and the beadle.

Constant labor of one uniform kind destroys the intensity and flow of a man's animal spirits, which find recreation and delight in mere change of activity.

The religious world is but a reflex of the real world.

All science would be superfluous if the outward appearance and the essence of things directly coincided.