On the Holy Trinity

³¹ For as to that, too, which follows in Exodus, “I will cover you with mine hand while I pass by, and I will take away my hand and you shall see my back parts;” many Israelites, of whom Moses was then a figure, believed in the Lord after His resurrection, as if His hand had been taken off from their eyes, and they now saw His back parts. And hence the evangelist also mentions that prophesy of Isaiah, “Make the heart of this people fat, and make their ears heavy, and shut their eyes.” Lastly, in the Psalm, that is not unreasonably understood to be said in their person, “For day and night Your hand was heavy upon me.” “By day,” perhaps, when He performed manifest miracles, yet was not acknowledged by them; but “by night,” when He died in suffering, when they thought still more certainly that, like any one among men, He was cut off and brought to an end. But since, when He had already passed by, so that His back parts were seen, upon the preaching to them by the Apostle Peter that it behooved Christ to suffer and rise again, they were pricked in their hearts with the grief of repentance, that that might come to pass among the baptized which is said in the beginning of that Psalm, “Blessed are they whose transgressions are forgiven, and whose sins are covered;” therefore, after it had been said, “Your hand is heavy upon me,” the Lord, as it were, passing by, so that now He removed His hand, and His back parts were seen, there follows the voice of one who grieves and confesses and receives remission of sins by faith in the resurrection of the Lord: “My moisture,” he says, “is turned into the drought of summer. I acknowledged my sin unto You, and mine iniquity have I not hid. I said, I will confess my transgressions unto the Lord, and You forgave the iniquity of my sin.” For we ought not to be so wrapped up in the darkness of the flesh, as to think the face indeed of God to be invisible, but His back visible, since both appeared visibly in the form of a servant; but far be it from us to think anything of the kind in the form of God; far be it from us to think that the Word of God and the Wisdom of God has a face on one side, and on the other a back, as a human body has, or is at all changed either in place or time by any appearance or motion.

32. Wherefore, if in those words which were spoken in Exodus, and in all those corporeal appearances, the Lord Jesus Christ was manifested; or if in some cases Christ was manifested, as the consideration of this passage persuades us, in others the Holy Spirit, as that which we have said above admonishes us; at any rate no such result follows, as that God the Father never appeared in any such form to the Fathers. For many such appearances happened in those times, without either the Father, or the Son, or the Holy Spirit being expressly named and designated in them; but yet with some intimations given through certain very probable interpretations, so that it would be too rash to say that God the Father never appeared by any visible forms to the fathers or the prophets. For they gave birth to this opinion who were not able to understand in respect to the unity of the Trinity such texts as, “Now unto the King eternal, immortal, invisible, the only wise God;” and, “Whom no man has seen, nor can see.” Which texts are understood by a sound faith in that substance itself, the highest, and in the highest degree divine and unchangeable, whereby both the Father and the Son and the Holy Spirit is the one and only God. But those visions were wrought through the changeable creature, made subject to the unchangeable God, and did not manifest God properly as He is, but by intimations such as suited the causes and times of the several circumstances.