For since Nicodemus had said, "We know that Thou art a teacher come from God," on this very point He sets him right, all but saying, "Think Me not a teacher in such manner as were the many of the prophets who were of earth, for I have come from heaven (but) now. None of the prophets hath ascended up thither, but I dwell there."
St. John Chrysostom
Homily 27 on John 3, 4th Century
For not in heaven only is He, but everywhere, and He fills all things; but yet He speaks according to the infirmity of His hearer, desiring to lead him up little by little ... For after having spoken of the very great benefaction that had come to man by Baptism, He proceeds to mention another benefaction, which was the cause of this, and not inferior to it; namely, that by the Cross ...
St. John Chrysostom
Homily 27 on John 3, 4th Century
Our Redeemer and Maker, Who was Son of God before the ages, became Son of Man at the end of ages. Thus the One Who, through the power of His divinity, had created us to enjoy the happiness of everlasting life, might Himself restore us, through the weakness of our humanity, to recover the life we had lost.
St. Bede the Venerable
Homilies on the Gospels, 2.18. 7th Century. Taken from: Ancient Christian Commentary on Scripture. Vol: John 1-10. Intervarsity Press, 2006, p. 126.
Now if the Jews, by looking to the brazen image of a serpent, escaped death, much rather will they who believe on the Crucified, with good reason enjoy a far greater benefit ... Seest thou the cause of the Crucifixion, and the salvation which is by it?
St. John Chrysostom
Homily 27 on John 3, 4th Century
"He gave His Only-begotten Son," not a servant, not an Angel, not an Archangel. And yet no one would show such anxiety for his own child, as God did for His ungrateful servants ... He who giveth life to others, much more to Himself doth He well forth life ... For He calls the Cross the fountain of life; which reason cannot easily allow, as the heathens now by their mocking testify. But faith which goes beyond the weakness of reasoning, may easily receive and retain it.
St. John Chrysostom
Homily 27 on John 3, 4th Century