David Bentley Hart (The Beauty of the Infinite, pp. 176-177):
The harmony of Father and Son is not the absolute music of an undifferentiated noise, but the open, diverse, and complete polyphony of Father, Son, and Spirit.
…The most elemental statement of theological aesthetics is that God is beautiful: not only that God is beauty or the essence and archetype of beauty, nor even only that God is the highest beauty, but that, as Gregory the Theologian says, “God is beauty and also beautiful, whose radiance shines upon and is reflected in his creatures” (Oration 28.30-31).
…God’s beauty is delight and the object of delight, the shared gaze of love that belongs to the persons of the Trinity; it is what God beholds, what the Father sees and rejoices in the Son, in the sweetness of the Spirit, what Son and Spirit find delightful in one another, because as Son and Spirit of the Father they share his knowledge and love as persons. This cannot be emphasized enough: the Christian God, who is infinite, is also infinitely formosus, the supereminent fullness of all form, transcendently determinate, always possessed of his Logos. True beauty is not the idea of the beautiful, a static archetype in the “mind” of God, but is an infinite “music,” drama, art, completed in–but never “bounded” by–the termless dynamism of the Trinity’s life; God is boundless, and so is never a boundary; his music possesses the richness of every transition, interval, measure variation–all dancing and delight. And because he is beautiful, being abounds with difference: shape, variety, manifold relation. Beauty is the distinction of the different, the otherness of the other, the true form of distance. And the Holy Spirit who perfects the divine love, so that it is not only reflective but also evocative–calling out to yet another as pure delight, outgoing, both uncompelled and unlimited–also makes the divine joy open to the otherness of what is not divine, of creation, without estranging it from its divine “logic”; and the Spirit communicates difference as primordially the gift of the beauty, because his difference within the Trinity is the happiness that perfects desire, the fulfillment of love; for the Spirit comes to rest in the Son, there finding all the joy he seeks, reinflecting the distance between Father and Son not just as bare cognizance, but as delight, the whole rapture of the divine essence.