110 If, then, any one desires to see this Image of God, he must love God, that he may be loved by God; and be no longer a servant but a friend, because he has kept the commandments of God, that he may enter into the cloud where God is. Let him make to himself two reasonable trumpets of beaten work of proved silver, that is, composed of precious words and adorned, from which not a harsh shrill sound with dread-inspiring voice may be uttered, but high thanks to God may be poured forth with continuous exultation. For by the voice of such trumpets the dead are raised, not indeed by the sound of the metal, but aroused by the word of truth. And perchance it is those two trumpets by which Paul, through the Divine Spirit, spoke when he said: “I will pray with the Spirit, and I will pray with the understanding, I will sing with the Spirit, and I will sing with the understanding;” for the one without the other seems by no means to have perfect utterance.
Source: On the Death of Satyrus (New Advent)