What is philosophy? "When we ask: What is philosophy?, we are talking about philosophy. By asking in this way, we apparently remain on a standpoint above and thus outside of philosophy. However, the aim of our question is to enter into philosophy, to dwell within it, to behave according to its manner, that is, to 'philosophize'." (M. Heidegger) From the experience of thinking, contributions from 1947 that revolve around poetry, art, and music. The diversity of thinking experiences clearly shows that Martin Heidegger's philosophical endeavor has gone far beyond general philosophy. Serenity includes: - Serenity: The speech was delivered at the celebration of the 175th birthday of composer Conradin Kreutzer on October 30, 1955, in Messkirch. - On the discussion of serenity - From a country road.