The two lectures come from Martin Heidegger's rectorate year. The lecture "The fundamental question of philosophy" unfolds the question of being in a first step in contrast to the entanglement of Christian determination and mathematical-logical justification thoughts in the metaphysical systems of the 18th century (Wolff, Baumgarten), which reached its completion in Hegel's metaphysics as Theo logic achieved. The lecture "On the Essence of Truth" repeats the lecture of the same name from the winter semester 1931/32 in a different form. He asks about the early and deeper reason for the historical change in the nature of truth from unconcealedness to correctness (of the statement). Although both lectures show an approximation of contemporary political diction. [Publisher's synopsis].