This mystery the apostle refers to Christ and the Church. Just as "that which is born of the flesh is flesh, so that which is born of the spirit is spirit" not only in respect of its birth but also of what is acquired by learning. Thus "the children also are holy," they are well-pleasing to God, in that the Lord's words bring the soul as a bride to God. Fornication and marriage are therefore different things, as far apart as God is from the devil.
The Lord himself axiomatically and distinctly pronounced, “that which is born of the flesh is flesh,” because it is born from the flesh. But if he here spoke simply of a human being and not of himself, then you must deny absolutely that Christ is man and must maintain that human nature was not suitable to him. And then he adds, “That which is born of the Spirit is spirit,” because God is a Spirit, and he was born of God. Now this description is certainly even more applicable to him than it is to those who believe in him. But if this passage indeed applies to him, then why does not the preceding one also? For you cannot divide their relation and adapt this to him and the previous clause to all other people, especially as you do not deny that Christ possesses the two substances, both of the flesh and of the Spirit. Besides, as he was in possession both of flesh and of Spirit, he cannot possibly—when speaking of the condition of the two substances that he himself bears—be supposed to have determined that the Spirit indeed was his own but that the flesh was not his own. Forasmuch, therefore, as he is of the Spirit, he is God the Spirit and is born of God; just as he is also born of the flesh of man, being generated in the flesh as man.
And if not from itself, but from something else, from what can we more suitably suppose that the Word became flesh than from that flesh in which it submitted to the dispensation? And (we have a proof of the same conclusion in the fact) that the Lord Himself sententiously and distinctly pronounced, "that which is born of the flesh is flesh," even because it is born of the flesh.
But if He here spoke of a human being simply, and not of Himself, (as you maintain) then you must deny absolutely that Christ is man, and must maintain that human nature was not suitable to Him. And then He adds, "That which is born of the Spirit is spirit," because God is a Spirit, and He was born of God.
Learn then, together with Nicodemus, that "that which is born in the flesh is flesh, and that which is born of the Spirit is Spirit." Neither the flesh becomes Spirit, nor the Spirit flesh.
This, he says, is ocean, "generation of gods and generation of men" ever whirled round by the eddies of water, at one time upwards, at another time downwards. But he says there ensues a generation of men when the ocean flows downwards; but when upwards to the wall and fortress and the cliff of Luecas, a generation of gods takes place. This, he asserts, is that which has been written: "I said, Ye are gods, and all children of the highest; " "If ye hasten to fly out of Egypt, and repair beyond the Red Sea into the wilderness," that is, from earthly intercourse to the Jerusalem above, which is the mother of the living; "If, moreover, again you return into Egypt," that is, into earthly intercourse, "ye shall die as men." For mortal, he says, is every generation below, but immortal that which is begotten above, for it is born of water only, and of spirit, being spiritual, not carnal. But what (is born) below is carnal, that is, he says, what is written. "That which is born of the flesh is flesh, and that which is born of the spirit is spirit." This, according to them, is the spiritual generation. This, he says, is the great Jordan which, flowing on (here) below, and preventing the children of Israel from departing out of Egypt-I mean from terrestrial intercourse, for Egypt is with them the body,-Jesus drove back, and made it flow upwards.
And these indeed are testimonies bearing on the incarnation of the Word; and there are also very many others. But let us also look at the subject in hand,-namely, the question, brethren, that in reality the Father's power, which is the Word, came down from heaven, and not the Father Himself. For thus He speaks: "I came forth from the Father, and am come." Now what subject is meant in this sentence, "I came forth from the Father," but just the Word? And what is it that is begotten of Him, but just the Spirit, that is to say, the Word? But you will say to me, How is He begotten? In your own case you can give no explanation of the way in which you were begotten, although you see every day the cause according to man; neither can you tell with accuracy the economy in His case. For you have it not in your power to acquaint yourself with the practised and indescribable art (method) of the Maker, but only to see, and understand, and believe that man is God's work. Moreover, you are asking an account of the generation of the Word, whom God the Father in His good pleasure begat as He willed. Is it not enough for you to learn that God made the world, but do you also venture to ask whence He made it? Is it not enough for you to learn that the Son of God has been manifested to you for salvation if you believe, but do you also inquire curiously how He was begotten after the Spirit? No more than two, in sooth, have been put in trust to give the account of His generation after the flesh; and are you then so bold as to seek the account (of His generation) after the Spirit, which the Father keeps with Himself, intending to reveal it then to the holy ones and those worthy of seeing His face? Rest satisfied with the word spoken by Christ, viz., "That which is born of the Spirit is spirit," just as, speaking by the prophet of the generation of the Word, He shows the fact that He is begotten, but reserves the question of the manner and means, to reveal it only in the time determined by Himself. For He speaks thus: "From the womb, before the morning star, I have begotten Thee."
Nemesianus of Thubunae said: That the baptism which heretics and schismatics bestow is not the true one, is everywhere declared in the Holy Scriptures, since their very leading men are false Christs and false prophets, as the Lord says by Solomon: "He who trusteth in that which is false, he feedeth the winds; and the very same, moreover, followeth the flight of birds. For he forsaketh the ways of his own vineyard, he has wandered from the paths of his own little field. But he walketh through pathless places, and dry, and a land destined for thirst; moreover, he gathereth together fruitless things in his hands." And again: "Abstain from strange water, and from the fountain of another do not drink, that you may live a long time; also that the years of life may be added to thee." And in the Gospel our Lord Jesus Christ spoke with His divine voice, saying, "Except a man be born again of water and the Spirit, he cannot enter the kingdom of God." This is the Spirit which from the beginning was borne over the waters; for neither can the Spirit operate without the water, nor the water without the Spirit. Certain people therefore interpret for themselves ill, when they say that by imposition of the hand they receive the Holy Ghost, and are thus received, when it is manifest that they ought to be born again in the Catholic Church by both sacraments. Then indeed they will be able to be sons of God, as says the apostle: "Taking care to keep the unity of the Spirit in the bond of peace. There is one body, and one Spirit, as ye have been called in one hope of your calling; one Lord, one faith, one baptism, one God." All these things speaks the Catholic Church. And again, in the Gospel the Lord says: "That which is born of the flesh is flesh, and that which is born of the Spirit is spirit; because God is a Spirit, and he is born of God." Therefore, whatsoever things all heretics and schismatics do are carnal, as the apostle says: "For the works of the flesh are manifest, which are, fornications, uncleannesses, incest, idolatries, witchcrafts, hatreds, contentions, jealousy, anger, divisions, heresies, and the like to these; concerning which have told you before, as I also foretell you now, that whoever do such things shall not inherit the kingdom of God." And thus the apostle condemns, with all the wicked, those also who cause division, that is, schismatics and heretics. Unless therefore they receive saving baptism in the Catholic Church, which is one, they cannot be saved, but will be condemned with the carnal in the judgment of the Lord Christ.
As God the Father is Spirit and as God the Son is Spirit, therefore our God and Father begets by the Spirit the one who is Son and God. Therefore Christ is of one substance with the Father according to his divine nature and of one substance with his mother according to his flesh. The one and the same Christ is from both, unchangeably and without confusion [of the two natures]. But according to what is now canonically held concerning the Logos of the Lord, our minds too are then to be transformed by Christ to be completely conformed to that which is spiritual.
We know too that the flesh is subject to death because of sin, but the Spirit of God is both incorruptible and life-giving and beyond death. As at our physical birth there comes into the world with us a potentiality of being again turned to dust, plainly the Spirit also imparts a life-giving potentiality to the children begotten by himself. What lesson, then, do we learn from this? We learn that we should wean ourselves from this life in the flesh, which has an inevitable follower, death; and that we should search for a way of life that does not bring death along with it.
Every man with whom are these and such like things — every such man is of the flesh. For, "he that is born of the flesh is flesh; and he that is of the earth speaks of the earth," [John 3:6, 31] and his thoughts are of the earth. And "the mind of the flesh is enmity towards God. For it does not submit itself to the law of God; for it cannot do so," [Romans 8:7] because it is in the flesh, "in which dwells no good," [Romans 7:18] because the Spirit of God is not in it.
Great mysteries are they, of which the Only-begotten Son of God has counted us worthy; great, and such as we were not worthy of, but such as it was meet for Him to give. For if one reckon our desert, we were not only unworthy of the gift, but also liable to punishment and vengeance; but He, because He looked not to this, not only delivered us from punishment, but freely gave us a life much more bright than the first, introduced us into another world, made us another creature; "If any man be in Christ," saith Paul, "he is a new creature." (2 Cor. v. 17.) What kind of "new creature"? Hear Christ Himself declare; "Except a man be born of water and of the Spirit, he cannot enter into the Kingdom of God."
There is no longer a mother, or pangs, or sleep, or coming together, and embracings of bodies; henceforth all the fabric of our nature is framed above, of the Holy Ghost and water. The water is employed, being made the Birth to him who is born; what the womb is to the embryo, the water is to the believer; for in the water he is fashioned and formed. At first it was said, "Let the waters bring forth the creeping things that have life" (Gen. i. 20); but from the time that the Lord entered the streams of Jordan, the water no longer gives forth the "creeping thing that hath life," but reasonable and Spirit-bearing souls.
That which is fashioned in the womb requires time, not so that in water, but all is done in a single moment. Here our life is perishable, and takes its origin from the decay of other bodies; that which is to be born comes slowly, (for such is the nature of bodies, they acquire perfection by time,) but it is not so with spiritual things. And why? Because the things made are formed perfect from the beginning.
"That which is born of the flesh is flesh: and that which is born of the Spirit is spirit." He leads him away from all the things of sense and suffers him not vainly to pry into the mysteries revealed with his fleshly eyes; "We speak not," saith He, "of flesh, but of Spirit, O Nicodemus," (by this word He directs him heavenward for a while,) "seek then nothing relating to things of sense; never can the Spirit appear to those eyes, think not that the Spirit bringeth forth the flesh."
"That which is born of the Spirit is spirit." Seest thou the dignity of the Spirit? It appears performing the work of God; for above he said of some, that, "they were begotten of God," (c. i. 13,) here He saith, that the Spirit begetteth them.
"That which is born of the Spirit is spirit." His meaning is of this kind; "He that is born of the Spirit is spiritual." For the Birth which He speaks of here is not that according to essence, but according to honor and grace. Now if the Son is so born also, in what shall He be superior to men so born? And how is He, Only-begotten? For I too am born of God, though not of His Essence, and if He also is not of His Essence, how in this respect does He differ from us? Nay, He will then be found to be inferior to the Spirit; for birth of this kind is by the grace of the Spirit.
(Hom. xxvi. in Joan. 1) Do not look then for any material production, or think that the Spirit generates flesh; for even the Lord's flesh is generated not by the Spirit only, but also by the flesh. That which is born of the Spirit is spiritual. The birth here spoken of takes place not according to our substance, but according to honour and grace. But the birth of the Son of God is otherwise; for else what would He have been more than all who are born again? And He would be proved too inferior to the Spirit, inasmuch as His birth would be by the grace of the Spirit. How does this differ from the Jewish doctrine?—But mark next the part of the Holy Spirit, in the divine work. For whereas above some are said to be born of God, (c. 1:13.) here, we find, the Spirit generates them.
He means that the work of generating is necessarily similar to the nature of the generator: when flesh generates flesh, necessarily the generation is bodily. When the spirit is the generator, it is necessary that we understand the generation as incorporeal and spiritual. Through this he also demonstrates that the water, which he united to the Spirit, does not operate with him but is mentioned as a symbol and for a [visible] use. Therefore he did not add “what is born of water” but only says “what is born of the Spirit” by clearly attributing the work of generating to the Spirit.
"But why," they ask, "does a baptized believer, whose sin has already been forgiven, beget a child who is still burdened with the first person's sin?" Because he begets him from the flesh, not from the spirit. "What is born of the flesh is flesh." "And if the outer self," says the apostle, "is decaying, yet the inner self is being renewed from day to day." It is not from what is being renewed in you that you beget a child. You beget a child from what is decaying in you. You, in order not to die forever, were born and reborn. This child is already born, not yet reborn. If you are alive as a result of being reborn, allow it too to be reborn and live.… Why oppose this? Why try to smash the ancient rule of faith with new objections? After all, what is this that you are saying: "Little children don't have even original sin in the least degree"? What does this that you say amount to, but that they should not come to Jesus? But Jesus cries out to you, "Let the little children come to me."
"That which is born of the flesh is flesh; and that which is born of the Spirit is spirit." We are born spiritually then, and spirit we are born by the word and sacrament. The Spirit is present that we may be born; the Spirit is invisibly present whereof thou art born, for thou too must be invisibly born.
By another argument again He persuades him to mount up to a higher understanding, and on hearing of spiritual birth, not to think of the properties of bodies. For as it is altogether necessary, saith He, that the offspring of flesh should be flesh, so also is it that those of the Spirit should be spirit. For in things the mode of whose being is different, in these must surely the mode of generation also be not the same. But it is to be known that we call the spirit of a man the offspring of the Spirit, not as being of It by Nature (for that were impossible), but in the first place, and that in order of time, because that through Him that which was not was called into being, and in the second place and oeconomically, because of its being re-formed unto God through Him, He stamping His Own Impress upon us, and trans-fashioning our understanding to His own Quality, so to speak. For so I deem, you will understand aright that too which is said to some by Paul, My little children, of whom I travail in birth again until Christ be formed in you, and again, For in Christ Jesus I have begotten you through the Gospel.
If the only meaning of baptism were remission of sins, why would we baptize newborn children who have not yet tasted of sin? But the mystery of baptism is not limited to this. It is a promise of greater and more perfect gifts. In it are the promises of future delights. It is the type of the future resurrection, a communion with the master’s Passion, a participation in his resurrection, a mantle of salvation, a tunic of gladness, a garment of light, or rather it is light itself.
(Hom. in Oct. Pent.) But Nicodemus being unable to take in so great and deep mysteries, our Lord helps him by the analogy of our carnal birth, saying, That which is born of the flesh is flesh, and that which is born of the Spirit is spirit. For as flesh generates flesh, so also doth spirit spirit.
[AD 215] Clement of Alexandria on John 3:6