Preface to the Revised Translation, 1939

The German term “Idee,” on the other hand, means more than an ordinary concept. It is a “fuller, more saturated, more comprehensive concept.” The philosophic systems of Kant, Schelling, Hegel and indeed the whole of German philosophy are quite unthinkable without this term. Chapter IX of this book gives an outstanding example in its title: “Die Idee der Freiheit.” In order to indicate this reference with the German term “Idee” we have translated it as “Idea,” printed with a capital “ I ” throughout the book.