Acts 2:4

Touching the time , however, the extrinsic observance of certain hours will not be unprofitable, those common hours, I mean, which mark the intervals of the day, the third, the sixth, the ninth, which we may find in the Scriptures to have been more solemn than the rest. The first infusion of the Holy Spirit into the congregated disciples took place at “the third hour.” Peter, on the day on which he experienced the vision of Universal Community, (exhibited) in that small vessel, had ascended into the more lofty parts of the house , for prayer’s sake “at the sixth hour.” The same (apostle) was going into the temple, with John, “at the ninth hour ,” when he restored the paralytic to his health. …

In like manner they censure on the count of novelty our Stations as being enjoined ; some, moreover, (censure them) too as being prolonged habitually too late, saying that this duty also ought to be observed of free choice, and not continued beyond the ninth hour, (deriving their rule), of course, from their own practice. Well: as to that which pertains to the question of injunction , I will once for all give a reply to suit all causes. Now, (turning) to the point which is proper to this particular cause, concerning the limit of time, I mean, I must first demand from themselves whence they derive this prescriptive law for concluding Stations at the ninth hour. …

In Exodus: “And the whole of Mount Sinai smoked, because God had come down upon it in fire.” Also in the Acts of the Apostles: “And suddenly there was made a sound from heaven, as if a vehement blast were borne along, and it filled the whole of that place in which they were sitting. And there appeared to them cloven tongues as if of fire, which also settled upon each of them; and they were all filled with the Holy Ghost.” Also in the sacrifices, whatsoever God accounted accepted, fire descended from heaven, which consumed what was sacrificed. In Exodus: “The angel of the Lord appeared in a flame of fire from the bush.”

XX . For even now, on the tenth day of the month Gorpiæus, when they assemble together, they read the Lamentations of Jeremiah, in which it is said, “The Spirit before our face, Christ the Lord was taken in their destructions;” and Baruch, in whom it is written, “This is our God; no other shall be esteemed with Him. He found out every way of knowledge, and showed it to Jacob His son, and Israel His beloved. Afterwards He was seen upon earth, and conversed with men.” And when they read them, they lament and bewail, as themselves suppose, that desolation which happened by Nebuchadnezzar ; but, as the truth shows, they unwillingly make a prelude to that lamentation which will overtake them. …

9. I alternately quaked with fear, and warmed with hope, and with rejoicing in Thy mercy, O Father. And all these passed forth, both by mine eyes and voice, when Thy good Spirit, turning unto us, said, O ye sons of men, how long will ye be slow of heart? “How long will ye love vanity, and seek after leasing?” For I had loved vanity, and sought after leasing. And Thou, O Lord, hadst already magnified Thy Holy One, raising Him from the dead, and setting Him at Thy right hand, whence from on high He should send His promise, the Paraclete, “the Spirit of Truth.” And He had already sent Him, but I knew it not; He had sent Him, because He was now magnified, rising again from the dead, and ascending into heaven. …

7. All those Catholic expounders of the divine Scriptures, both Old and New, whom I have been able to read, who have written before me concerning the Trinity, Who is God, have purposed to teach, according to the Scriptures, this doctrine, that the Father, and the Son, and the Holy Spirit intimate a divine unity of one and the same substance in an indivisible equality; and therefore that they are not three Gods, but one God: although the Father hath begotten the Son, and so He who is the Father is not the Son; and the Son is begotten by the Father, and so He who is the Son is not the Father; and the Holy Spirit is neither the Father nor the Son, but only the Spirit of the Father and of the Son, Himself also co-equal with the Father and the Son, and pertaining to the unity of the Trinity. …

10. If, therefore, He is said to be sent, in so far as He appeared outwardly in the bodily creature, who inwardly in His spiritual nature is always hidden from the eyes of mortals, it is now easy to understand also of the Holy Spirit why He too is said to be sent. For in due time a certain outward appearance of the creature was wrought, wherein the Holy Spirit might be visibly shown; whether when He descended upon the Lord Himself in a bodily shape as a dove, or when, ten days having past since His ascension, on the day of Pentecost a sound came suddenly from heaven as of a rushing mighty wind, and cloven tongues like as of fire were seen upon them, and it sat upon each of them. …

11. It is, then, for this reason nowhere written, that the Father is greater than the Holy Spirit, or that the Holy Spirit is less than God the Father, because the creature in which the Holy Spirit was to appear was not taken in the same way as the Son of man was taken, as the form in which the person of the Word of God Himself should be set forth not that He might possess the word of God, as other holy and wise men have possessed it, but “above His fellows;” not certainly that He possessed the word more than they, so as to be of more surpassing wisdom than the rest were, but that He was the very Word Himself. For the word in the flesh is one thing, and the Word made flesh is another; i.e. the word in man is one thing, the Word that is man is another. …

26. But as far as concerns our present undertaking, neither on Mount Sinai do I see how it appears, by all those things which were fearfully displayed to the senses of mortal men, whether God the Trinity spake, or the Father, or the Son, or the Holy Spirit severally. But if it is allowable, without rash assertion, to venture upon a modest and hesitating conjecture from this passage, if it is possible to understand it of one person of the Trinity, why do we not rather understand the Holy Spirit to be spoken of, since the Law itself also, which was given there, is said to have been written upon tables of stone with the finger of God, by which name we know the Holy Spirit to be signified in the Gospel. …

27. But now, as I think, that which we had undertaken to show in this book has been sufficiently discussed and demonstrated, according to our capacity; and it has been established, both by probable reason, so far as a man, or rather, so far as I am able, and by strength of authority, so far as the divine declarations from the Holy Scriptures have been made clear, that those words and bodily appearances which were given to these ancient fathers of ours before the incarnation of the Saviour, when God was said to appear, were wrought by angels: whether themselves speaking or doing something in the person of God, as we have shown that the prophets also were wont to do, or assuming from the creature that which they themselves were not, wherein God might be shown in a figure to men; which manner of showing also, Scripture teaches by many examples, that the prophets, too, did not omit. …

29. As, therefore, the Father begat, the Son is begotten; so the Father sent, the Son was sent. But in like manner as He who begat and He who was begotten, so both He who sent and He who was sent, are one, since the Father and the Son are one. So also the Holy Spirit is one with them, since these three are one. For as to be born, in respect to the Son, means to be from the Father; so to be sent, in respect to the Son, means to be known to be from the Father. And as to be the gift of God in respect to the Holy Spirit, means to proceed from the Father; so to be sent, is to be known to proceed from the Father. Neither can we say that the Holy Spirit does not also proceed from the Son, for the same Spirit is not without reason said to be the Spirit both of the Father and of the Son. …

46. But the reason why, after His resurrection, He both gave the Holy Spirit, first on earth, and afterwards sent Him from heaven, is in my judgment this: that “love is shed abroad in our hearts,” by that Gift itself, whereby we love God and our neighbors, according to those two commandments, “on which hang all the law and the prophets.” And Jesus Christ, in order to signify this, gave to them the Holy Spirit, once upon earth, on account of the love of our neighbor, and a second time from heaven, on account of the love of God. And if some other reason may perhaps be given for this double gift of the Holy Spirit, at any rate we ought not to doubt that the same Holy Spirit was given when Jesus breathed upon them, of whom He by and by says, “Go, baptize all nations in the name of the Father, and of the Son, and of the Holy Spirit,” where this Trinity is especially commended to us. …