John 3:10

Indeed, he [Nicodemus] should have known what came from the Law and the Prophets: the cleansing with hyssop, the waters for ceremonial sprinkling, the baptisms for cleansing, and all the rest. If these had not been signified as types before the coming of the Son, our Lord would have been accusing Nicodemus falsely because of them. But if they were hidden from him in his Scriptures, and he did not clearly identify them, he [our Lord] rightly put to flight his sleep, healed his infirmity by his gentle voice, and reminded him of the baptism of atonement that existed in Israel.… But this was done gently, because he [our Lord] saw that he [Nicodemus] was sick but close to healing. And since he did not understand what was previously written down in the Law, our Lord showed him the baptism of complete atonement for both body and soul. Truly, Nicodemus, did you not perceive that Jacob was born into the right of the firstborn without [the aid of] belly or womb, or that Naaman was renewed apart from a womb when Elisha spoke to him? … And likewise for Miriam. Come now, was it not known that this was a sign of baptism given to the nations, for hyssop makes what was stained white?

What then doth Nicodemus? still he continues in his low Jewish opinion, and that too when so clear an example has been mentioned to him. Wherefore when he again says doubtingly, "How can these things be?" Christ now speaks to him more chidingly; "Art thou a master in Israel, and knowest not these things?" Observe how He nowhere accuses the man of wickedness, but only of weakness and simplicity.

"And what," one may ask, "has this birth in common with Jewish matters?" Tell me rather what has it that is not in common with them? For the first-created man, and the woman formed from his side, and the barren women, and the things accomplished by water, I mean what relates to the fountain on which Elisha made the iron tool to swim, to the Red Sea which the Jews passed over, to the pool which the Angel troubled, to Naaman the Syrian who was cleansed in Jordan, all these proclaimed beforehand, as by a figure, the Birth and the purification which were to be. And the words of the Prophet allude to the manner of this Birth, as, "It shall be announced unto the Lord a generation which cometh, and they shall announce His righteousness unto a people that shall be born, whom the Lord hath made" (Ps. xxii. 30; xxx. 31 LXX.); and, "Thy youth shall be renewed as an eagle's" (Ps. ciii. 5, Ps. ciii. 5 LXX.); and, "Shine, O Jerusalem; behold, Thy King cometh!" (Isa. lx. 1; Zech. ix. 9); and, "Blessed are they whose iniquities are forgiven." (Ps. xxxii. 1, Ps. xxxii. 1 LXX.)

Isaac also was a type of this Birth. For tell me, Nicodemus, how was he born? was it according to the law of nature? By no means; the mode of his generation was midway between this of which we speak and the natural; the natural, because he was begotten by cohabitation; the other, because he was begotten not of blood, (but by the will of God.) I shall show that these figures proclaimed beforehand not only this birth, but also that from the Virgin. For, because no one would easily have believed that a virgin could bear a child, barren women first did so, then such as were not only barren, but aged also. That a woman should be made from a rib was indeed far more wonderful than that the barren should conceive; but because that was of early and old time, another figure, new and fresh, was given, that of the barren women; to prepare the way for belief in the Virgin's travail. To remind him then of these things, Jesus said, "Art thou a master in Israel, and knowest not these things?"

(Tr. xii. c. 6) What think we? that our Lord wished to insult this master in Israel? He wished him to be born of the Spirit: and no one is born of the Spirit except he is made humble; for this very humility it is, which makes us to be born of the Spirit. He however was inflated with his eminence as a master, and thought himself of importance because he was a doctor of the Jews. Our Lord then casts down his pride, in order that he may be born of the Spirit.

"Jesus answered and said unto him, Art thou a master in Israel, and knowest not these things?" Oh, brethren! What do we think that the Lord meant to taunt scornfully this master of the Jews? The Lord knew what He was doing; He wished the man to be born of the Spirit. No man is born of the Spirit if he be not humble, for humility itself makes us to be born of the Spirit; "for the Lord is nigh to them that are of broken heart." The man was puffed up with his mastership, and it appeared of some importance to himself that he was a teacher of the Jews. Jesus pulled down his pride, that he might be born of the Spirit: He taunted him as an unlearned man; not that the Lord wished to appear his superior. What comparison can there be, God compared to man, truth to falsehood? Christ greater than Nicodemus! Ought this to be said, can it be said, is it to be thought? If it were said, "Christ is greater than angels," it were ridiculous: for incomparably greater than every creature is He by whom every creature was made. But yet He rallies the man on his pride: "Art thou a master in Israel, and knowest not these things?" As if He said, Behold, thou knowest nothing, thou art a proud chief; be thou born of the Spirit: for if thou be born of the Spirit, thou wilt keep the ways of God, so as to follow Christ's humility.

By one Christ convicts all, that adorned with the name of teachers, and clothed with the mere repute of being learned in the law, they bear a mind full of ignorance, and unable to understand one of those things, which they ought not only to know, but also to be able to teach others. But if he that instructeth be in this condition, in what is he that is instructed, seeing that the disciple exceedeth not the measure of his master, according to the word of the Saviour? For the disciple, saith He, is not above his master. But since they were thus uninstructed, true is Christ in likening them to whited sepulchres. Most excellently doth Paul too say to the ruler of the Jews, God shall smite thee, thou whited wall.

Therefore the Lord also, showing him that he asks thus out of simplicity, says: "You are a teacher of Israel. If you recall the glorious miracles performed in the Old Testament, beginning from the creation of man and onward, namely: how he was created (Gen. 2:7), how the woman was made from a rib (Gen. 2:21–22), how signs were performed in Egypt, how at the Red Sea (Exod. 7, 8, 9, 14), how barren women gave birth (1 Sam. 1), and the like — if you consider this, as a teacher of Israel, then you will also believe what I am now saying."

And this is what follows: Jesus replied. First the Lord chides him for his slowness. Secondly, he answers his question (v 13).

He chides him for his slowness, basing himself on three things. First, the condition of the person to whom he is speaking, when he says, You are a teacher in Israel. And here the Lord did not chide him to insult him. Rather, because Nicodemus, presuming on his own knowledge, was still relying on his status as a teacher, the Lord wished to make him a temple of the Holy Spirit by humbling him: "For whom will I have regard? For he who is humble and of contrite spirit" (Is 66:2). And he says, You are a teacher, because it is tolerable if a simple person cannot grasp profound truths, but in a teacher, it deserves rebuke. And so he says, You are a teacher, i.e., of the letter that kills (2 Cor 3:6), and you do not know these things? i.e., spiritual things. "For although you ought to be teachers by now, you yourselves need to be taught again" (Heb 5:12).

You might say that the Lord would have rebuked Nicodemus justly if he had spoken to him about matters of the Old Law and he did not understand them; but he spoke to him about the New Law. I answer that the things which the Lord says of spiritual generation are contained in the Old Law, although under a figure, as is said in 1 Corinthians (10:2): "All were baptized into Moses, in the cloud and in the sea." And the prophets also said this: "I will pour clean water upon you, and you will be cleansed from all your uncleanness" (Ez 36:25).