54. But if any one thinks that the word of the prophet is to be explained with reference to the Holy Spirit, because it is said, “declaring unto men His Christ,” Amos iv. 13. he will explain it more easily of the Lord’s Incarnation. For if it troubles you that he said Spirit, and therefore you think that this cannot well be explained of the mystery of the taking of human nature, read on in the Scriptures and you will find that all agrees most excellently with Christ, of Whom it is thoroughly fitting to think that He established the thunders by His coming, that is, the force and sound of the heavenly Scriptures, by the thunder, as it were, of which our minds are struck with astonishment, so that we learn to be afraid, and pay respect to the heavenly oracles.