The animal is one with its life activity. It does not distinguish the activity from itself. It is its activity. But man makes hislife activity itself an object of his will and consciousness. He has a conscious life activity. It is not a determination with which he is completely identified.
Erich Fromm, Karl Marx (2013). “Marx's Concept of Man: Including 'Economic and Philosophical Manuscripts'”, p.87, Bloomsbury Publishing