The narrative that has been read to us is indeed most renowned, and, by reason of its greatness, is known to the whole world; through it is signified how Egypt, together with king Pharaoh, was chastised by the mighty blows of signs and wonders, so that it might restore to its native liberty the Hebrew people, which, though born of free forefathers, it had "by violence" reduced to servitude. But the account of these deeds is so interwoven that, if you inspect the several details carefully, you will find more matters in which the understanding sticks fast than in which it can extricate itself. And because it is a long task to set forth each thing said by Scripture in its order, let us review the substance of the whole history in a more compendious way. So then, at the first sign "Aaron cast down his rod, and it became a dragon"; and the enchanters and sorcerers of the Egyptians were summoned, and "they did likewise" out of their rods, making dragons. But the dragon that had been made from Aaron's rod swallowed up the dragons of the Egyptians. And whereas this ought to have caused Pharaoh astonishment and to have profited toward belief, it was turned to the contrary. For Scripture says that: "the heart of Pharaoh was hardened, and he did not hearken to them". And here indeed it says that "the heart of Pharaoh was hardened"; but no less in the first plague also, where the water is turned into blood, it is written in like manner, and in the second when the frogs bubble up, and also in the third when the gnats come on; in the fourth too when the dog-fly is brought forth, and in the fifth, where "the hand of the Lord comes upon the cattle" of the Egyptians, things equal and similar are said on this point. But in the sixth, where Moses "took ashes of the furnace" "and sprinkled them, and there arose sores and burning blisters upon men and upon the four-footed beasts, and now the sorcerers could not stand in the presence of Moses", it is not said that the heart of Pharaoh was hardened, but something more terrible is added; for it is written that: "the Lord hardened the heart of Pharaoh, and he did not hear them, even as the Lord had appointed". Again in the seventh, when hail and fire lay waste all Egypt, "the heart of Pharaoh" is indeed "hardened", but not by the Lord. But in the eighth, where the locust is brought forth, "the Lord" is said "to harden the heart of Pharaoh". And in the ninth also, when "palpable darkness comes over the whole land of Egypt", "the Lord" is written "to harden the heart of Pharaoh". And at the very last too, when, the firstborn of the Egyptians having been destroyed, the Hebrew people had departed, after many things it is thus said: "and the Lord hardened the heart of Pharaoh king of Egypt and of his servants, and he pursued after the children of Israel". Moreover, when Moses is sent from the land of Midian to Egypt and is commanded "to do all the wonders which the Lord had put into his hands", it is added: "thou shalt do them", he says, "in the presence of Pharaoh. But I will harden the heart of Pharaoh, and he will not let the people go". Here first it was said by the Lord: "I will harden the heart of Pharaoh". And a second time also, where the princes of Israel have been enumerated, after a little he adds in the person of the Lord: "I", he says, "will harden the heart of Pharaoh, and I will multiply my signs".
But if we believe these letters to be divine and written by the Holy Spirit, I do not think that we should feel so unworthily of the divine Spirit as to suppose that in so great a work this variation was made by chance — that now indeed God is said to have "hardened the heart of Pharaoh", but now it is said to have been hardened not by God, but as it were of its own accord. For my part, I confess myself too little fit and too little capable to be able to search out the secrets of the divine wisdom amid variations of this kind. Yet I see Paul the Apostle, who, because of the Spirit of God dwelling in him, dared to say with confidence: "but to us God has revealed it through his Spirit. For the Spirit searches all things, even the deep things of God". — him, I say, I see, as one understanding what difference there is between "the heart of Pharaoh being hardened" and "the Lord having hardened the heart of Pharaoh", saying elsewhere indeed: "or dost thou despise the riches of his goodness and forbearance and long-suffering, not knowing that the patience of God leads thee to repentance? But according to thy hardness and impenitent heart thou treasurest up for thyself wrath against the day of wrath and of the revelation of the just judgment of God"; whereby without doubt he blames him who has been hardened of his own accord. But elsewhere, as though proposing a certain question upon this matter, he says: "therefore on whom he will he has mercy, and whom he will he hardens. Thou wilt then say to me: why then does he yet complain? For who shall resist his will?". He adds also to these: "O man, who art thou that repliest against God?". Whereby concerning him who is said to be hardened by the Lord he answers, I believe, not so much by the resolution of the question as by Apostolic authority, not judging it worthy, because of the incapacity of his hearers, to commit the secrets of resolutions of this kind to "paper and ink"; just as in another place also he himself says concerning certain words that he had "heard" certain things "which it is not lawful for men to speak". Whence too in what follows he deters, with the severity of a great teacher, the man who, not so much by the merit of his studies as by a craving to know, plunges himself curiously into more hidden questions, when he says: "O man, who art thou that repliest against God? Does the thing formed say to him who formed it: why hast thou made me thus?" and the rest. Whence for us too let it suffice only to have observed and inspected these things, and to have shown our hearers how great are the mysteries plunged in the depths of the divine law, on account of which we ought to say in prayer: "out of the depths have I cried unto thee, O Lord".
But that observation too seems to me to be no less worthy of consideration, that certain blows are said to be inflicted upon Pharaoh or upon Egypt by Aaron, certain by Moses, and certain by the Lord himself. For in the first plague, when "he turned the waters into blood", Aaron is said to have lifted up the rod and to have struck the water. And in the second also, when he struck the waters "and brought forth frogs", and in the third, when "he stretched out the rod with his hand and struck the dust of the earth, and there were gnats". In these three blows there was the ministry of Aaron. But in the fourth the Lord is said to have done it, so that "the dog-fly should come" and fill "the houses of Pharaoh". And in the fifth also, when "the cattle of the Egyptians are destroyed", the Lord no less is said to have done "this thing". But in the sixth Moses "sprinkles ashes of the furnace, and there arise sores and blisters with burning upon men and cattle". And in the seventh too "Moses lifts up his hand to heaven", and there arise "thunders and hail, and fire runs about upon the earth". In the eighth likewise the same Moses stretches out his hand to heaven, "and the Lord brings a wind all that day and all that night", and brings the locusts. And in the ninth also the same "Moses stretches out his hand to heaven, and there arise darkness and gloom over all the land of Egypt". But in the tenth the end and completion of the whole work is administered by the Lord. For thus it is written: "and it came to pass about midnight, and the Lord struck every firstborn in the land of Egypt, from the firstborn of Pharaoh, who sat upon the throne, unto the firstborn of the captive woman who is in the pit, and every firstborn of the cattle".
There is also another difference in these matters, which we have observed: that in the first plague indeed, when the water flows into blood, it is not yet said to Moses that he should go in to Pharaoh, but it is said to him: "go to meet him at the bank of the river, when he comes out to the water". But in the second plague, after the first had been ministered by them constantly and faithfully, it is said to him: "go in to Pharaoh", and going in he says: "thus says the Lord", and the rest. But now in the third, where the gnats are brought on, the magicians, who had before withstood, yield, confessing that "this is the finger of God". In the fourth too Moses is bidden to "rise early in the morning and to stand before Pharaoh as he goes forth to the water", when the houses of the Egyptians are filled with the dog-fly. In the fifth no less, where the cattle of the Egyptians are destroyed, "Moses is bidden to go in to Pharaoh". In the sixth, however, Pharaoh is despised, and it is not related that Moses or Aaron went in to Pharaoh, because "there arose sores and blisters with burning even upon the sorcerers of Egypt, and they could not withstand Moses". In the seventh he is bidden to "rise very early in the morning and to stand before Pharaoh", when he brings forth hail and fire and thunders. In the eighth he is commanded to go in to him, when the locust is brought forth. In the ninth again Pharaoh is despised, and "Moses is commanded to stretch out his hand to heaven, that there may be darkness over all the land of Egypt, palpable darkness", and indeed he does not go in, but is called to Pharaoh. Likewise also in the tenth, when the firstborn are destroyed and he is compelled with haste to go out from Egypt. There are also very many other observations, in each of which the tokens of the divine wisdom are shown. For you will find that at first Pharaoh is not bent nor yields to the divine blows, when the waters have been turned into blood. But in the second he seems to be somewhat softened: for "he called", it says, "Moses and Aaron, and said to them: pray for me to the Lord, and let him take away the frogs from me and from my people, and I will let the people go". In the third the magicians yield and say to Pharaoh: "this is the finger of God". In the fourth, beaten by the dog-fly, he says: "go, sacrifice to the Lord your God, but you shall not go too far on your way. Pray therefore for me to the Lord". In the fifth, where he is smitten by the slaying of the cattle, he not only does not yield, but is hardened all the more. Likewise also in the sixth he does the same over the plague of sores. But in the seventh, when he is laid waste by hail and by fires: "Pharaoh sent", it says, "and called Moses and Aaron and said to them: I have sinned even now; the Lord is just, but I and my people are ungodly. Pray therefore for me to the Lord". In the eighth, when he is pressed by locusts: "and Pharaoh hastened", it says, "and called Moses and Aaron, saying: I have sinned before the Lord your God and against you. Take away my sin even now, and pray to the Lord your God". In the ninth, when he is covered with darkness: "Pharaoh called", it says, "Moses and Aaron, saying: go, serve the Lord your God". But now in the tenth, when the firstborn of men and of the cattle are destroyed: "Pharaoh called", it says, "Moses and Aaron by night and said to them: arise and go out from my people, both you and the children of Israel; go, serve the Lord your God, as you say: and taking your sheep and your oxen, depart, as you have said. But bless me also. And the Egyptians urged the people to go out of the land of Egypt as quickly as possible. For they said: we shall all die".
Who is he whom God may fill with that Spirit with which he filled Moses and Aaron, when they were accomplishing these wonders and signs, so that, illumined by the same Spirit, he might be able to expound the things done through them? For otherwise I do not think that these varieties and differences of mighty matters can be explained, unless they are expounded by the same Spirit by which they were done, since Paul the Apostle too says that: "the spirit of the prophets is subject to the prophets". Not therefore to any persons whatsoever are the sayings of the prophets said to be "subject" for their explanation, but "to the prophets". But since the same blessed Apostle bids us become imitators of this grace, that is, of the prophetic gift, as being in some part and within our power, saying: "but be zealous for the better gifts, and rather that you may prophesy", let us too attempt to take up a zeal for good things and to exert whatever is in us, but to await from the Lord the fullness of the gift. For with regard to the one it is said by the Lord through the prophet: "open thy mouth, and I will fill it", but with regard to the other another Scripture says: "prick the eye, and it brings forth a tear; prick the heart, and it brings forth understanding". Let us not therefore out of despair give ourselves over to silence, which certainly does not edify the Church of God; but let us briefly go back over the things of which we are able and in so far as we are able.
But if we believe these letters to be divine and written by the Holy Spirit, I do not think that we should feel so unworthily of the divine Spirit as to suppose that in so great a work this variation was made by chance — that now indeed God is said to have "hardened the heart of Pharaoh", but now it is said to have been hardened not by God, but as it were of its own accord. For my part, I confess myself too little fit and too little capable to be able to search out the secrets of the divine wisdom amid variations of this kind. Yet I see Paul the Apostle, who, because of the Spirit of God dwelling in him, dared to say with confidence: "but to us God has revealed it through his Spirit. For the Spirit searches all things, even the deep things of God". — him, I say, I see, as one understanding what difference there is between "the heart of Pharaoh being hardened" and "the Lord having hardened the heart of Pharaoh", saying elsewhere indeed: "or dost thou despise the riches of his goodness and forbearance and long-suffering, not knowing that the patience of God leads thee to repentance? But according to thy hardness and impenitent heart thou treasurest up for thyself wrath against the day of wrath and of the revelation of the just judgment of God"; whereby without doubt he blames him who has been hardened of his own accord. But elsewhere, as though proposing a certain question upon this matter, he says: "therefore on whom he will he has mercy, and whom he will he hardens. Thou wilt then say to me: why then does he yet complain? For who shall resist his will?". He adds also to these: "O man, who art thou that repliest against God?". Whereby concerning him who is said to be hardened by the Lord he answers, I believe, not so much by the resolution of the question as by Apostolic authority, not judging it worthy, because of the incapacity of his hearers, to commit the secrets of resolutions of this kind to "paper and ink"; just as in another place also he himself says concerning certain words that he had "heard" certain things "which it is not lawful for men to speak". Whence too in what follows he deters, with the severity of a great teacher, the man who, not so much by the merit of his studies as by a craving to know, plunges himself curiously into more hidden questions, when he says: "O man, who art thou that repliest against God? Does the thing formed say to him who formed it: why hast thou made me thus?" and the rest. Whence for us too let it suffice only to have observed and inspected these things, and to have shown our hearers how great are the mysteries plunged in the depths of the divine law, on account of which we ought to say in prayer: "out of the depths have I cried unto thee, O Lord".
But that observation too seems to me to be no less worthy of consideration, that certain blows are said to be inflicted upon Pharaoh or upon Egypt by Aaron, certain by Moses, and certain by the Lord himself. For in the first plague, when "he turned the waters into blood", Aaron is said to have lifted up the rod and to have struck the water. And in the second also, when he struck the waters "and brought forth frogs", and in the third, when "he stretched out the rod with his hand and struck the dust of the earth, and there were gnats". In these three blows there was the ministry of Aaron. But in the fourth the Lord is said to have done it, so that "the dog-fly should come" and fill "the houses of Pharaoh". And in the fifth also, when "the cattle of the Egyptians are destroyed", the Lord no less is said to have done "this thing". But in the sixth Moses "sprinkles ashes of the furnace, and there arise sores and blisters with burning upon men and cattle". And in the seventh too "Moses lifts up his hand to heaven", and there arise "thunders and hail, and fire runs about upon the earth". In the eighth likewise the same Moses stretches out his hand to heaven, "and the Lord brings a wind all that day and all that night", and brings the locusts. And in the ninth also the same "Moses stretches out his hand to heaven, and there arise darkness and gloom over all the land of Egypt". But in the tenth the end and completion of the whole work is administered by the Lord. For thus it is written: "and it came to pass about midnight, and the Lord struck every firstborn in the land of Egypt, from the firstborn of Pharaoh, who sat upon the throne, unto the firstborn of the captive woman who is in the pit, and every firstborn of the cattle".
There is also another difference in these matters, which we have observed: that in the first plague indeed, when the water flows into blood, it is not yet said to Moses that he should go in to Pharaoh, but it is said to him: "go to meet him at the bank of the river, when he comes out to the water". But in the second plague, after the first had been ministered by them constantly and faithfully, it is said to him: "go in to Pharaoh", and going in he says: "thus says the Lord", and the rest. But now in the third, where the gnats are brought on, the magicians, who had before withstood, yield, confessing that "this is the finger of God". In the fourth too Moses is bidden to "rise early in the morning and to stand before Pharaoh as he goes forth to the water", when the houses of the Egyptians are filled with the dog-fly. In the fifth no less, where the cattle of the Egyptians are destroyed, "Moses is bidden to go in to Pharaoh". In the sixth, however, Pharaoh is despised, and it is not related that Moses or Aaron went in to Pharaoh, because "there arose sores and blisters with burning even upon the sorcerers of Egypt, and they could not withstand Moses". In the seventh he is bidden to "rise very early in the morning and to stand before Pharaoh", when he brings forth hail and fire and thunders. In the eighth he is commanded to go in to him, when the locust is brought forth. In the ninth again Pharaoh is despised, and "Moses is commanded to stretch out his hand to heaven, that there may be darkness over all the land of Egypt, palpable darkness", and indeed he does not go in, but is called to Pharaoh. Likewise also in the tenth, when the firstborn are destroyed and he is compelled with haste to go out from Egypt. There are also very many other observations, in each of which the tokens of the divine wisdom are shown. For you will find that at first Pharaoh is not bent nor yields to the divine blows, when the waters have been turned into blood. But in the second he seems to be somewhat softened: for "he called", it says, "Moses and Aaron, and said to them: pray for me to the Lord, and let him take away the frogs from me and from my people, and I will let the people go". In the third the magicians yield and say to Pharaoh: "this is the finger of God". In the fourth, beaten by the dog-fly, he says: "go, sacrifice to the Lord your God, but you shall not go too far on your way. Pray therefore for me to the Lord". In the fifth, where he is smitten by the slaying of the cattle, he not only does not yield, but is hardened all the more. Likewise also in the sixth he does the same over the plague of sores. But in the seventh, when he is laid waste by hail and by fires: "Pharaoh sent", it says, "and called Moses and Aaron and said to them: I have sinned even now; the Lord is just, but I and my people are ungodly. Pray therefore for me to the Lord". In the eighth, when he is pressed by locusts: "and Pharaoh hastened", it says, "and called Moses and Aaron, saying: I have sinned before the Lord your God and against you. Take away my sin even now, and pray to the Lord your God". In the ninth, when he is covered with darkness: "Pharaoh called", it says, "Moses and Aaron, saying: go, serve the Lord your God". But now in the tenth, when the firstborn of men and of the cattle are destroyed: "Pharaoh called", it says, "Moses and Aaron by night and said to them: arise and go out from my people, both you and the children of Israel; go, serve the Lord your God, as you say: and taking your sheep and your oxen, depart, as you have said. But bless me also. And the Egyptians urged the people to go out of the land of Egypt as quickly as possible. For they said: we shall all die".
Who is he whom God may fill with that Spirit with which he filled Moses and Aaron, when they were accomplishing these wonders and signs, so that, illumined by the same Spirit, he might be able to expound the things done through them? For otherwise I do not think that these varieties and differences of mighty matters can be explained, unless they are expounded by the same Spirit by which they were done, since Paul the Apostle too says that: "the spirit of the prophets is subject to the prophets". Not therefore to any persons whatsoever are the sayings of the prophets said to be "subject" for their explanation, but "to the prophets". But since the same blessed Apostle bids us become imitators of this grace, that is, of the prophetic gift, as being in some part and within our power, saying: "but be zealous for the better gifts, and rather that you may prophesy", let us too attempt to take up a zeal for good things and to exert whatever is in us, but to await from the Lord the fullness of the gift. For with regard to the one it is said by the Lord through the prophet: "open thy mouth, and I will fill it", but with regard to the other another Scripture says: "prick the eye, and it brings forth a tear; prick the heart, and it brings forth understanding". Let us not therefore out of despair give ourselves over to silence, which certainly does not edify the Church of God; but let us briefly go back over the things of which we are able and in so far as we are able.
Source: HOMILIES ON EXODUS 4