One can delineate the domain of philosophy however one likes, but in its search for truth, philosophy is always concerned with human existence. Authentic philosophizing refuses to remain at the stage of knowledge [โฆ]. Care for human existence and its truth makes philosophy a 'practical science' in the deepest sense, and it also leads philosophyโand this is the crucial pointโinto the concrete distress of human existence.
Herbert MarcuseWhere these reduced (operational - E.W.) concepts govern the analysis of the human reality, individual or social, mental or material, they arrive at a false concreteness - a concreteness isolated from the conditions which constitute its reality. In this context, the operational treatment of the concept assumes a political function. The individual and his behavior are analyzed in a therapeutic sense - adjustment to his society. Thought and expression, theory and practice are to be brought in line with the facts of his existence without leaving room for the conceptual critique of these facts.
Herbert Marcuse