"Starting from Leibniz"s principle of sufficient reason ..., Heidegger reflects on the relation of modern and ancient philosophy and of poetry and thinking...an accurate and readable English translation." - "Choice." "Recreates the intellectual footwork necessary for Heidegger"s leap from the terra cognita of modernity into the existential questions of the age of technology." - Michael Heim. "The Principle of Reason", the text of an important and influential lecture course that Martin Heidegger gave in 1955-56, takes as its focal point Leibniz"s principle: nothing is without reason. Heidegger shows here that the principle of reason is in fact a principle of being. One of Heidegger"s most artfully composed texts, it also contains important discussions of language, translation, reason, objectivity, and technology - as well as remarkable readings of Leibniz, Kant, Aristotle, and Goethe, among others.