"Metaphysics reflects on the nature of the existent and on the nature of truth. Metaphysics lays the foundation of an age by giving it the basis of its essential form through a particular analysis of the existent and a particular conception of truth. This basis dominates all the phenomena which distinguish the age. Conversely, it must be possible to recognize the metaphysical basis in these phenomena through sufficient reflection on them. Reflection is the courage to question as deeply as possible the truth of our own presuppositions and the exact place of our own aims."