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 […]. Care for human existence and its truth makes philosophy a 'practical science' in the deepest sense, and it also leads philosophy—and this is the crucial point—into the concrete distress of human existence.

Heideggerian Marxism (ed. U of Nebraska Press, 2005) - ISBN: 9780803250550