434 It is clear, therefore, that just as one does not have bodily vision unless he is born, so one cannot have spiritual vision unless he is reborn. And according to the threefold regeneration, there is a threefold kind of vision.
435 Note that the Greek reading is not “again,” but anothe, i.e., “from above,” which Jerome translated as “again,” in order to suggest addition. And this is the way Jerome understood the saying, unless one is born again. It is as if he were saying: Unless one is reborn once more through a fraternal generation.
Chrysostom, however, says that to be “born from above” is peculiar to the Son of God, because he alone is born from above: “The one who came from above is above all things” (below 3:31). And Christ is said to be born from above both as to time (if we may speak thus), because he was begotten from eternity: “Before the daystar I begot you” (Ps 109:3), and as to the principle of his generation, because he proceeds from the heavenly Father: “I came down from heaven not to do my own will, but the will of him who sent me” (below 6:38). Therefore, because our regeneration is in the likeness of the Son of God, inasmuch as “Those whom he foreknew he predestined to become conformed to the image of his Son” (Rom 8:29), and because that generation is from above, our generation also is from above: both as to the time, because of our eternal predestination, “He chose us in him before the foundation of the world” (Eph 1:4), and as to its being a gift of God, as we read below (6:44), “No one can come to me unless the Father, who sent me, draws him”; and “You have been saved by the grace of God” (Eph 2:5).
436 Then when he says, Nicodemus said to him, he gives the manner of and the reason for this spiritual regeneration. First, the doubt of Nicodemus is set forth. Secondly, Christ’s response (v 5).
437 As to the first we should note that as stated in 1 Corinthians (2:14): “The sensual man does not perceive those things that pertain to the Spirit of God.” And so because Nicodemus was yet carnal and sensual, he was unable to grasp, except in a carnal manner, the things that were said to him. Consequently, what the Lord said to him about spiritual regeneration, he understood of carnal generation. And this is what he says: How can a man be born again when he is already an old man?
We should note here, according to Chrysostom, that Nicodemus wanted to object to what was said by the Savior. But his objection is foolish, because Christ was speaking of spiritual regeneration, and he is objecting in terms of carnal regeneration. In like manner, all the reasons brought forth to attack the things of faith are foolish, since they are not according to the meaning of Sacred Scripture.
438 Nicodemus objected to the Lord’s statement that a man must be born again according to the two ways in which this seemed impossible. In one way, on account of the irreversibility of human life; for a man cannot return to infancy from old age. Hence we read, “I am walking on a path,” namely, this present life, “by which I will not return” (Jb 16:23). And it is from this point of view that he says, How can a man be born again when he is already an old man? As if to say: Shall he become a child once more so that he can be reborn? “He will not return again to his home, and his place will not know him any more” (Jb 7:10). In the second way, regeneration seemed impossible because of the mode of carnal generation. For in the beginning, when a man is generated, he is small in size, so that his mother’s womb can contain him; but later, after he is born, he continues to grow and reaches such a size that he cannot be contained within his mother’s womb. And so Nicodemus says, Is it possible for him to return to his mother’s womb and be born all over again? As if to say: He cannot, because the womb cannot contain him.
439 But this does not apply to spiritual generation. For no matter how spiritually old a man might become through sin, according to the Psalm (31:3): “Because I kept silent, all my bones grew old,” he can, with the help of divine grace, become new, according to the Psalm (102:5): “Your youth will be renewed like the eagle’s.” And no matter how enormous he is, he can enter the spiritual womb of the Church by the sacrament of baptism. And it is clear what that spiritual womb is; otherwise it would never have been said: “From the womb, before the daystar, I begot you” (Ps 109:3). Yet there is a sense in which his objection applies. For just as a man, once he is born according to nature, cannot be reborn, so once he is born in a spiritual way through baptism, he cannot be reborn, because he cannot be baptized again: “One Lord, one faith, one baptism,” as we read in Ephesians (4:5).
440 Then we have the answer of Christ. Concerning this he does three things. First, he answers the arguments of Nicodemus by showing the nature of regeneration. Secondly, he explains this answer with a reason (v 6). Thirdly, he explains it with an example.
441 He answers the objections by showing that he is speaking of a spiritual regeneration, not a carnal one. And this is what he says: unless one is born again of water and the Holy Spirit, he cannot enter the kingdom of God. As if to say: You are thinking of a carnal generation, but I am speaking of a spiritual generation.
Note that above he had said, he cannot see the kingdom of God, while here he says, he cannot enter the kingdom of God, which is the same thing. For no one can see the things of the kingdom of God unless he enters it; and to the extent that he enters, he sees. “I will give him a white stone upon which is written a new name, which no one knows but he who receives it” (Rv 5:5).
442 Now there is a reason why spiritual generation comes from the Spirit. It is necessary that the one generated be generated in the likeness of the one generating; but we are regenerated as sons of God, in the likeness of his true Son. Therefore, it is necessary that our spiritual regeneration come about through that by which we are made like the true Son. and this comes about by our having his Spirit: “If any one does not have the Spirit of Christ, he is not his” (Rom 8:9); “By this we know that we abide in him, and he in us: because he has given us of his Spirit” (1 Jn 4:13). Thus spiritual regeneration must come from the Holy Spirit. “You did not receive the spirit of slavery, putting you in fear again, but the spirit of adoption” (Rom 8:15); “It is the Spirit that gives life” (below 6:63).
443 Water, too, is necessary for this regeneration, and for three reasons. First, because of the condition of human nature. For man consists of soul and body, and if the Spirit alone were involved in his regeneration, this would indicate that only the spiritual part of man is regenerated. Hence in order that the flesh also be regenerated, it is necessary that, in addition to the Spirit through whom the soul is regenerated, something bodily be involved, through which the body is regenerated; and this is water.
Secondly, water is necessary for the sake of human knowledge. For, as Dionysius says, divine wisdom so disposes all things that it provides for each thing according to its nature. Now it is natural for man to know; and so it is fitting that spiritual things be conferred on men in such a way that he may know them: “so that we may know what God has given us” (1 Cor 2:12). But the natural manner of this knowledge is that man know spiritual things by means of sensible things, since all our knowledge begins in sense knowledge. Therefore, in order that we might understand what is spiritual in our regeneration, it was fitting that there be in it something sensible and material, that is, water, through which we understand that just as water washes and cleanses the exterior in a bodily way, so through baptism a man is washed and cleansed inwardly in a spiritual way.
Thirdly, water was necessary so that there might be a correspondence of causes. For the cause of our regeneration is the incarnate Word: “He gave them power to become the sons of God,” as we saw above (1:12). Therefore it was fitting that in the sacraments, which have their efficacy from the power of the incarnate Word, there be something corresponding to the Word, and something corresponding to the flesh, or body. And spiritually speaking, this is water when the sacrament is baptism, so that through it we may be conformed to the death of Christ, since we are submerged in it during baptism as Christ was in the womb of the earth for three days: “We are buried with him by baptism” (Rom 6:4).
Further, this mystery was suggested in the first production of things, when the Spirit of God hovered over the waters (Gn 1:2). But a greater power was conferred on water by contact with the most pure flesh of Christ; because in the beginning water brought forth crawling creatures with living souls, but since Christ was baptized in the Jordan, water has yielded spiritual souls.
444 It is clear that the Holy Spirit is God, since he says, unless one is born again of water and the Holy Spirit ( ex aqua et Spiritu Sancto ). For above (1:13) he says: “who are born not from blood, nor from the desires of the flesh, nor from man’s willing it, but from God ( ex Deo ).” From this we can form the following argument: He from whom men are spiritually reborn is God; but men are spiritually reborn through the Holy Spirit, as it is stated here; therefore, the Holy Spirit is God.
445 Two questions arise here. First, if no one enters the kingdom of God unless he is born again of water, and if the fathers of old were not born again of water (for they were not baptized), then they have not entered the kingdom of God. Secondly, since baptism is of three kinds, that is, of water, of desire, and of blood, and many have been baptized in the latter two ways (who we say have entered the kingdom of God immediately, even though they were not born again of water), it does not seem to be true to say that unless one is born again of water and the Holy Spirit, he cannot enter the kingdom of God.
The answer to the first is that rebirth or regeneration from water and the Holy Spirit takes place in two ways: in truth and in symbol. Now the fathers of old, although they were not reborn with a true rebirth, were nevertheless reborn with a symbolic rebirth, because they always had a sense perceptible sign in which true rebirth was prefigured. So according to this, thus reborn, they did enter the kingdom of God, after the ransom was paid.
The answer to the second is that those who are reborn by a baptism of blood and fire, although they do not have regeneration in deed, they do have it in desire. Otherwise neither would the baptism of blood mean anything nor could there be a baptism of the Spirit. Consequently, in order that man may enter the kingdom of heaven, it is necessary that there be a baptism of water in deed, as in the case of all baptized persons, or in desire, as in the case of the martyrs and catechumens, who are prevented by death from fulfilling their desire, or in symbol, as in the case of the fathers of old.
446 It might be remarked that it was from this statement, unless one is born again of water and the Holy Spirit, that the Pelagians derived their error that children are baptized not in order to be cleansed from sin, since they have none, but in order to be able to enter the kingdom of God. But this is false, because as Augustine says in his book, The Baptism of Children, it is not fitting for an image of God, namely, man, to be excluded from the kingdom of God except for some obstacle, which can be nothing but sin. Therefore, there must be some sin, namely, original sin, in children who are excluded from the kingdom.
447 Then when he says, What is born of flesh is itself flesh, he proves by reason that it is necessary to be born of water and the Holy Spirit. And the reasoning is this: No one can reach the kingdom unless he is made spiritual; but no one is made spiritual except by the Holy Spirit; therefore, no one can enter the kingdom of God unless he is born again of the Holy Spirit.
So he says, what is born of flesh ( ex carne ) is itself flesh, i.e., birth according to the flesh makes one be born into the life of the flesh: “The first man was from the earth, earthly” (1 Cor 15:47); and what is born of Spirit ( ex Spiritu ), i.e., from the power of the Holy Spirit, is itself spirit, i.e., spiritual.
448 Note, however, that this preposition ex (from, of, by) sometimes designates a material cause, as when I say: “A knife is made of ( ex ) iron”; sometimes it designates an efficient cause, as when I say: “The house was built by ( ex ) a carpenter.” Accordingly, the phrase, what is born of ( ex ) flesh is itself flesh, can be understood according to either efficient or material causality. As efficient cause, indeed, because a power existing in flesh is productive of generation; and as material cause, because some carnal element in animals makes up the animal generated. But nothing is said to be made out of spirit ( ex spiritu ) in a material sense, since spirit is unchangeable, whereas matter is the subject of change; but it is said in the sense of efficient causality.
According to this, we can discern a threefold generation. One is materially and effectively from ( ex ) the flesh, and is common to all who exist according to the flesh. Another is according to the Spirit effectively, and according to it we are reborn as sons of God through the grace of the Holy Spirit, and are made spiritual. The third is midway, that is, only materially from the flesh but effectively from the Holy Spirit. And this is true in the singular case of Christ: because he was born deriving his flesh materially from the flesh of his mother, but effectively from the Holy Spirit: “What she has conceived is of the Holy Spirit” (Mt 1:20). Therefore, he was born holy: “The Holy Spirit will come upon you, and the power of the Most High will overshadow you. And so the Holy One who will be born from you, will be called the Son of God” (Lk 1:35).