  Yorck's primary category of historical life does not only challenge transcendental philosophy as too-narrow a foothold for philosophy. A fortiori, it also challenges the entire metaphysical tradition, which presupposes or searches for an ultimate objective reality (being, idea, substance, and so on), divorced from the ground of the always shifting historical life. Yorck rejects claims to “knowledge” sub specie aeternitatis. For Yorck, metaphysics is a flight from the historical reality ‘on the ground.’ By making historical life primary, Yorck effectively aims to dismantle the predominance of Greek metaphysics, including the modes of thought of modern science derived from it.