John Chrysostom
"For we have become partakers of Christ." What does "we have become partakers of Christ" mean? We have become, he says, partakers of Him. We and He have become one. He is the Head, and we are His body, fellow heirs and members of the same body. We are one body with Him, of His flesh and of His bones. "If only we hold the beginning of our life firm to the end." What does "the beginning of our life" mean? He is speaking here about faith, by which we exist, have been born, and have become, so to speak, one being with Him. Then the Apostle inspires them with hope: "For we," he says, "have become partakers of Christ." It is as if he says: He who loved us so greatly and counted us worthy of such good things that He made us His body will not despise those who are perishing.
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Let us consider, he says, what we have been counted worthy to receive: we and Christ are one. Therefore let us not harbor unbelief toward Him. Here again he hints at what he said elsewhere: "If we endure, we shall also reign with Him" (2 Tim 2:12). This is precisely what "we have become partakers" means: we have a share in what belongs to Christ.