Nicodemus said to him, "How can a man be born when he is old? Can he enter a second time into his mother's womb, and be born?"
 Here the Lord introduces the cross. (Ver. John 3:14-15; John 3:14-15) It is not a question simply of the Son of God, nor is He spoken of here as the Word made flesh. But "as Moses lifted up the serpent in the wilderness, even so must ( δεῖ ) the Son of man be lifted up: that whosoever believeth in him should not perish, but have eternal life." As the new birth for the kingdom of God, so the cross is absolutely necessary for eternal life. In the Word was life, and the life was the light of men. It was not intended for other beings it was God's free gift to man, to the believer, of course. Man, dead in sins, was the object of His grace; but then man's state was such, that it would have been derogatory to God had that life been communicated without the cross of Christ: the Son of man lifted up on it was the One in whom God dealt judicially with the evil estate of man, for the, full consequences of which He made Himself responsible. It would not suit God, if it would suit man, that He, seeing all, should just pronounce on man's corruption, and then forthwith let him off with a bare pardon. One must be born again. But even this sufficed not: the Son of man must be lifted up. It was impossible that there should not be righteous dealing with human evil against God, in its sources and its streams. Accordingly, if the law raised the question of righteousness in man, the cross of the Lord Jesus, typifying Him made sin, is the answer; and there has all been settled to the glory of God, the Lord Jesus having suffered all the inevitable consequences. Hence, then, we have the Lord Jesus alluding to this fresh necessity, if man was to be blessed according to God. "As Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: that whosoever believeth in him should not perish, but have eternal life." But this, however worthy of God, and indispensable for man, could not of itself give an adequate expression of what God is; because in this alone, neither His own love nor the glory of His Son finds due display.
