Nevertheless, with all this, one must know that the promise of glory to believers is in no way shaken by this. This glory already exists. It has been prepared and awaits only those who would enter it. Let some fail to enter, being worthily denied by the Lord. Yet the worthy will always have the possibility of entering, for this Kingdom is opened and will eternally remain so.
Let us even suppose something impossible. Let us suppose that we all prove unfaithful and therefore worthy to be rejected and deprived of the Kingdom of glory. Even then this Kingdom still exists and will eternally remain open. For it is contained in the Lord Himself. Therefore, when the Lord exists, it also exists. The Lord always exists. Consequently, the Kingdom of glory always exists.
The Lord cannot deny Himself, that is, He cannot cease to be what He is. Nor can the Kingdom of glory cease, for it is in Him. Thus the promise of the Kingdom of glory is undoubtedly true, and the Lord who gave this promise is faithful. For to show Himself unfaithful in this would be the same as ceasing to be what He is.
He received humanity into His own Person and, having united it in Himself with the Trihypostatic Godhead, He deified it. Humanity has already been overshadowed by divine glory. No one and nothing can now undo this. This is the glory promised to believers. Drawing from it, they too will be clothed with glory.
The same thing may be explained in another way. “If we are faithless,” ει απιστουμεν, if we are unbelieving, or if, having believed, we prove unfaithful to the faith. “We” means not all, but some among us. The Apostle could not have meant all, since he himself believed perfectly and knew many, even very many, others who believed likewise.
Let some among the believers, he says, prove unfaithful and therefore be denied by the Lord. This in no way violates the Lord’s promise concerning the glorification of believers. This promise is set under the condition of faithfulness. They prove unfaithful and do not receive the promise. The faithful, however, will always receive it.
The Lord remains faithful both toward them, clothing them with glory, and toward the unfaithful, depriving them of it and denying them. Unbelief and unfaithfulness do not disturb His divine economy of salvation. They harm the unbelieving and unfaithful.
Thus Saint Chrysostom says: “By denying the faith, we harm ourselves, and by no means God. Nor can we harm Him. If He suffers no harm when we deny Him, this means that He requires our confession for nothing other than our own benefit. He remains one and the same, whether we deny Him or do not deny Him. For He cannot deny Himself, that is, deny what He is.”