Men can be distinguished from animals by consciousness, by religion or anything else the people like. They themselves begin to distinguish themselves from animals as soon as they begin to produce their means of subsistence, a step which is conditioned by their physical organisation. The production of ideas, of conceptions, of consciousness, is at first directly interwoven with the material activity and the material intercourse of men, the language of real life. The production of life, both of one’s own in labor and of fresh life in procreation, now appears as a double relationship: on the one hand as a natural, on the other as a social relationship. Every new class, therefore, achieves its hegemony only on a broader basis than that of the class ruling previously, whereas the opposition of the non-ruling class against the new ruling class later develops all the more sharply and profoundly.