In proportion therefore, as the repulsiveness of the work increases, the wage decreases. - Karl Marx

When the economists say that present-day relations – the relations of bourgeois production – are natural, they imply that these are the relations in which wealth is created and productive forces developed in conformity with the laws of nature. These relations therefore are themselves natural laws independent of the influence of time. They are eternal laws which must always govern society. Thus, there has been history, but there is no longer any.

The weapon of criticism obviously cannot replace the criticism of
weapons. Material force must be overthrown by material force. But
theory also becomes a material force once it has gripped the masses.

It [bourgeoisie] has resolved personal worth into exchange value, and in place of the numberless indefeasible chartered freedoms, has set up that single, unconscionable freedom – Free Trade.