John Chrysostom
Christ says words still more striking to him: "Are you a teacher of Israel, and do not know this?" Notice that He rebukes this man not at all for evil intent, but for shortsightedness and simplicity.
But what, someone may say, does this birth have in common with Jewish matters? What does it not have in common? Tell me. The origin of the first man, the creation of the woman from the rib, barrenness, and the miracles accomplished through waters all foretold in figures the birth and purification that were to come. These include the spring from which Elisha drew up the iron, the Red Sea through which the Jews passed, the pool stirred by an angel, and the Jordan in which Naaman the Syrian was cleansed.
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The utterances of the prophets also signify this image of birth. Thus it is said, "My posterity shall serve Him, and it shall be proclaimed to the Lord forever. They shall come and declare His righteousness to a people who will be born, that the Lord has done this" (Ps 21:31-32). Again, "Your youth is renewed like the eagle's" (Ps 102:5). Also, "Shine, O Jerusalem" (Is 60:1), "Behold, your King comes" (Zech 9:9), and "Blessed is he whose iniquities are forgiven" (Ps 31:1).
Isaac too was an image of this birth. Tell me, Nicodemus, how was Isaac born? According to the law of nature? No. The image of his birth stood between both births, fleshly and spiritual. It was fleshly because he was born from conjugal union, and spiritual because he was not born of blood.
I will show that these images foretold not only this birth, but also the birth from the Virgin. Since it would not have been easy to believe that a Virgin gives birth, barren women first gave birth. Not only barren women, but elderly women also gave birth.
Of course, the origin of the woman from the rib is much more wondrous than birth from a barren woman. Yet since that happened in the beginning, long ago, another, new and recent manner of birth followed, namely from barren women. This prepared the way for faith in the birth from the Virgin.
Recalling this to Nicodemus, Christ says, "Are you a teacher of Israel, and do not know this?"