The poetry of Rainer María Rilke has left us the testimony of a language that seeks, obsessively, silence. Of the extensive production of the great poet in German language stand out, for its terrible beauty, the Elegies of Duino, a poetic cycle that meant for him an enormous creative suffering, and that stands as a monument to the loneliness of the human being in the Europe of the first half of the twentieth century. From the beginning, this poetry that elevates us and makes us descend vertiginously in the spirit, attracted the attention of philosophers such as Martin Heidegger or Hans-Georg Gadamer, and theologians such as Romano Guardini and Hans Urs von Balthasar, who thought they guessed in the exalted lyricism of Rilke the ambiguous beats of metaphysical experience. The reading of Rilke presented here begins with Duino's Ninth Elegy and traces an interpretive network that runs through much of this sublime poetry, highlighting the concept of the unspeakable, a late expression that goes back to negative theology, as his greatest poetological achievement.