Acknowledging Messiaen’s occasional but consistently appreciative references to theologian Hans Urs von Balthasar, especially with respect to the theological aesthetics as presented in The Glory of the Lord (Herrlichkeit), this chapter provides a theological and Trinitarian description of Balthasar’s notion of doxa, or “glory,” which may well have influenced Messiaen’s compositions. For Balthasar, “glory” as a theological concept is neither merely aesthetic nor religiously triumphalist, but remains tangled together with transcendental beauty in Western metaphysics, theophany, kenoticism ( “ self-emptying”), a cruciform Christology, eschatology, and apocalyptic thought.