"The Erörterung of the principle of reason seeks out a panoramic view about what in the principle is said, without being expressed, regarding Being. "⁷³ The search for the unexpressed requires a field of reflection which can question all of metaphysics and, above all, can cause to emerge the problem that, in terms of simplicity, fundamentalness, and obviousness takes its place beside that of th e principle of reason: i.e., the question of Being. Even if one must not forget that this is the absolutely typical Heideggerian problem, some aspects of it can be found in the investigation about the foundation. It i s no accident that Heidegger always repeats: "Sein and Grund: the samething."