John Chrysostom
Therefore from now on we know no one according to the flesh. Even though we once knew Christ according to the flesh, yet now we know Him thus no longer.
"Therefore from now on we know no one according to the flesh" (v. 16). If all have died and all have risen, and have died in the way the dominion of sin condemned them to die, and have risen through the laver of regeneration and renewal of the Holy Spirit, then he rightly says that we know "no one" of the faithful "according to the flesh."
What does it matter, indeed, if they are still in the flesh? The former fleshly life has already ended. We have been born again from above by the Spirit. We have come to know another citizenship, abode, life, and order, namely the heavenly.
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The Apostle calls Christ the cause of all this. Therefore he added, "Even though we once knew Christ according to the flesh, yet now we know Him thus no longer."
Tell me, then, has He put off the flesh and is He now without a body? No. He is even now in the flesh, for it is said, "This Jesus, who was taken up from you into heaven, will come in the same manner" (Acts 1:11).
How "in the same manner"? In the flesh, with the body. How, then, does he say, "Even though we once knew Christ according to the flesh, yet now we know Him thus no longer"?
When applied to us, "according to the flesh" means being in sins. "Not according to the flesh" means not being in sins.
When applied to Christ, "according to the flesh" means nothing other than sharing the weaknesses of human nature, such as thirst, hunger, weariness, and sleep. For He "committed no sin, nor was deceit found in His mouth" (Is 53:9; 1 Pet 2:22).
Therefore He also said, "Which of you convicts Me of sin?" (Jn 8:46). Again He says, "The ruler of this world is coming, and he has nothing in Me" (Jn 14:30).
"Not according to the flesh" means that He has now been freed even from these weaknesses. It does not mean that He is now without flesh.
With flesh indeed, yet flesh no longer subject to suffering and now immortal, He will come to judge the world. We also shall come into such a state when our body is "conformed to the body of His glory" (Phil 3:21).