This is the first authoritative, book-length study of what Heidegger called "thinking poetics." That Is to Say conducts its analysis of Heideggerian poetics by expounding the sense of language from the perspective of fundamental ontology. This project is carried out in readings of the pertinent chapters of Being and Time, the lectures on Holderlin, "The Origin of the Work of Art," and On the Way to Language. The book is guided by a question that no other writer on Heidegger has yet asked: Why should poiesis provide a privileged access to the specificity of the poetic?