This book interprets Eckhart’s Latin and Middle High German writings under the banner of an imperative of releasement, and then shows how the twentieth-century thinker Martin Heidegger creatively appropriates this idea at several stages of his career. Heidegger had a lifelong fascination with Eckhart, referring to him as “the old master of letters and life.” Drawing on archival material and Heidegger’s marginalia in his personal copies of Eckhart’s writings, Ian Moore argues that Eckhart was one of the most important figures in Heidegger’s philosophy.