The values of commodities are directly as the times of labor employed in their production, and are inversely as the productive powers of the labor employed.

Machines were, it may be said, the weapon employed by the capitalists to quell the revolt of specialized labor.

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.

Capital is dead labor, which, vampire-like, lives only by sucking living labor, and lives the more, the more labor it sucks.

The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.

The entire so-called history of the world is nothing but the creation of man through human labor.