3 He then who calls the thing glory, and rebukes the disciple because he was trying to hinder Him, and proves that what constitutes the good shepherd is his sacrificing himself on behalf of the sheep, and declares that he earnestly longs for this thing, and willingly goes to meet it, how is it that He beseeches it may not come to pass? And if He did not wish it what difficulty was there in hindering those who came for that purpose? But in fact you behold Him hastening towards the deed. At least when they came upon Him He said “Whom do you seek?” and they replied “Jesus.” Then He says to them “Lo! I am He: and they went backward and fell to the ground.” Thus having first crippled them and proved that He was able to escape their hands, He then surrendered Himself, that you might learn that not by compulsion or force, or the tyrannical power of those who attacked Him, did He unwillingly submit to this, but willingly with purpose and desire, preparing for it a long time before. Therefore also were prophets sent beforehand, and patriarchs foretold the events, and by means of words and deeds the cross was prefigured. For the sacrifice of Isaac also signified the cross to us: wherefore also Christ said “Abraham your father rejoiced to see my glory and he saw it and was glad.” The patriarch then was glad beholding the image of the cross, and does He Himself deprecate it? Thus Moses also prevailed over Amalek when he displayed the figure of the cross: and one may observe countless things happening in the Old Testament descriptive by anticipation of the cross. For what reason then was this the case if He who was to be crucified did not wish it to come to pass? And the sentence which follows this is yet more perplexing. For having said Let this cup pass from me He added “nevertheless not as I will but as You will.” For herein as far as the actual expression is concerned we find two wills opposed to one another: if at least the Father desires Him to be crucified, but He Himself does not desire it. And yet we everywhere behold Him desiring and purposing the same things as the Father. For when He says “grant to them, as I and Thou are one that they also may be one in us,” it is equivalent to saying that the purpose of the Father and of the Son is one. And when He says “The words which I speak I speak not myself, but the Father which dwells in me, He does these works,” He indicates the same thing. And when He says “I have not come of myself” and “I can of my own self do nothing” he does not say this as signifying that He has been deprived of authority, either to speak or to act (away with the thought!), but as desiring to prove the concord of his purpose, both in words and deeds, and in every kind of transaction, to be one and the same with the Father, as I have already frequently demonstrated. For the expression “I speak not of myself” is not an abrogation of authority but a demonstration of agreement. How then does He say here “Nevertheless not as I will but as You will”? Perhaps I have excited a great conflict in your mind, but be on the alert: for although many words have been uttered I know well that your zeal is still fresh: for the discourse is now hastening on to the solution. Why then has this form of speech been employed? Attend carefully, The doctrine of the incarnation was very hard to receive. For the exceeding measure of His lovingkindness and the magnitude of His condescension were full of awe, and needed much preparation to be accepted. For consider what a great thing it was to hear and to learn that God the ineffable, the incorruptible, the unintelligible, the invisible, the incomprehensible, in whose hand are the ends of the earth, who looks upon the earth, and causes it to tremble, who touches the mountains, and makes them smoke, the weight of whose condescension not even the Cherubim were able to bear but veiled their faces by the shelter of their wings, that this God who surpasses all understanding, and baffles all calculation, having passed by angels, archangels, and all the spiritual powers above, deigned to become man, and to take flesh formed of earth and clay, and enter the womb of a virgin, and be borne there the space of nine months, and be nourished with milk, and suffer all things to which man is liable. Inasmuch then as that which was to happen was so strange as to be disbelieved by many even when it had taken place, He first of all sends prophets beforehand, announcing this very fact. For instance the patriarch predicted it saying “You sprang from a tender shoot my son: you lied down and slumber as a lion;” and Esaias saying “Behold the Virgin shall conceive and bear a son and they shall call His name Emmanuel;” and elsewhere again “We beheld Him as a young child, as a root in a dry ground;” and by the dry ground he means the virgin's womb. And again “unto us a child is born, unto us a son is given,” and again “there shall come forth a rod out of the root of Jesse, and a flower shall spring out of his root.” And Baruch in the book of Jeremiah says “this is our God: no other shall be reckoned by the side of Him: He found out every path of knowledge and gave it to Jacob His servant, and Israel his beloved. After these things also He appeared upon the earth, and held converse with men.” And David signifying His incarnate presence said “He shall come down like the rain into a fleece of wool, and like the drop which distills upon the earth” because He noiselessly and gently entered into the Virgin's womb.
4. But these proofs alone did not suffice, but even when He had come, lest what had taken place should be deemed an illusion, He warranted the fact not only by the sight but by duration of time and by passing through all the phases incident to man. For He did not enter once for all into a man matured and completely developed, but into a virgin's womb, so as to undergo the process of gestation and birth and suckling and growth, and by the length of the time and the variety of the stages of growth to give assurance of what had come to pass. And not even here were the proofs concluded, but even when bearing about the body of flesh He suffered it to experience the infirmities of human nature and to be hungry, and thirsty, and to sleep and feel fatigue; finally also when He came to the cross He suffered it to undergo the pains of the flesh. For this reason also streams of sweat flowed down from it and an angel was discovered strengthening it, and He was sad and down-cast: for before He uttered these words He said “my soul is troubled, and exceeding sorrowful ever unto death.” If then after all these things have taken place the wicked mouth of the devil speaking through Marcion of Pontus, and Valentinus, and Manichæus of Persia and many more heretics, has attempted to overthrow the doctrine of the Incarnation and has vented a diabolical utterance declaring that He did not become flesh, nor was clothed with it, but that this was mere fancy, and illusion, a piece of acting and pretence, although the sufferings, the death, the burial, the thirst, cry aloud against this teaching; supposing that none of these things had happened would not the devil have sown these wicked doctrines of impiousness much more widely? For this reason, just as He hungered, as He slept, as He felt fatigue, as He ate and drank, so also did He deprecate death, thereby manifesting his humanity, and that infirmity of human nature which does not submit without pain to be torn from this present life. For had He not uttered any of these things, it might have been said that if He were a man He ought to have experienced human feelings. And what are these? In the case of one about to be crucified, fear and agony, and pain in being torn from present life: for a sense of the charm which surrounds present things is implanted in human nature: on this account wishing to prove the reality of the fleshly clothing, and to give assurance of the incarnation He manifests the actual feelings of man with full demonstration.
Source: Homily on the Passage "Father, if it be possible . . ." (New Advent)