Against the indeterminacy, in which the understanding of Heidegger's thought on language moves most often, we attempt to show how two perfectly determined and distinct concepts of speaking appear in Unterwegs zur Sprache, two concepts arising from a view and a situation specific in each case to thought vis-à-vis speech. The first concerns speaking as thinking, and as speech, in this way, bears the meaning of a speaking of the being (Sein). The other concerns speaking taken as purely and simply naming, so that speech accordingly bears the meaning of a speaking of the being (Seiende). For this concept of speech Heidegger inaugurates a mode of questioning about the being of the word, from which we make it possible to perceive how a phenomenolo...