Rigorously studying the inexpressible expression provoked by the silenced testimony of the Holocaust survivor, in Jean-François Lyotard's The Differend, and the religious faithful, in Pseudo-Dionysius' The Divine Names, proves to dissolve the apparent heterogeneity of postmodernism and Neoplatonist Christian mysticism and open radical new lines of dialogue. Expressing the Inexpressible critically evaluates each thinker.