On the Feast of the Apparition of Saint Michael the Archangel at Monte Gargano, this homily immerses the faithful in the dramatic supernatural events through which Heaven visibly claimed the mountain for God. Against the rugged backdrop of fifth-century southern Italy, the mysterious stillness of the wandering bull, the arrow that reversed in mid-flight, and the revelation of the cavern already prepared as a sanctuary become signs of divine authority breaking into the created order. Drawing deeply from the Tridentine propers—especially the Introit, Apocalypse reading, Offertory, and Gospel—the sermon reflects on angelic obedience, the reality of spiritual warfare, the loss of reverence in the modern age. Contrasting the humility of the child in the Gospel with the pride of Lucifer, the homily calls the faithful to recover awe before the altar, awareness of the unseen world, and fidelity beneath the banner of the Archangel whose cry still resounds through Heaven and earth: Quis ut Deus?