First published in German in 1984 as volume 45 of Martin Heidegger's collected works, this book is the first English translation of a lecture course he presented at the University of Freiburg in 1937-1938. Heidegger's task here is to reassert the question of the essence of truth, not as a "problem" or as a matter of "logic," but precisely as a genuine philosophical question, in fact the one basic question of philosophy. Thus, this course is about...