John Chrysostom
What does "all the promises of God" mean? The preaching of the Gospel contains many promises, and the Apostles announced and preached many promises. They spoke of resurrection, of being caught up into heaven, of immortality, of great rewards in the life to come, and of the ineffable blessings there. These promises the Apostle calls immutable. He says that in them there was not Yes and No. The meaning of his words is this: "What I told you concerning these promises was not true at one time and false at another, as with my promise to come to you. It was always true." First of all, he defends the doctrines of the faith and the word concerning Christ.
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He says, "My word and my preaching were not Yes and No." Then he defends the promises themselves: "For all the promises of God in Him are Yes." If God's promises are faithful, and there is no doubt that God will fulfill them, then much more is He Himself faithful. The word concerning Him is firm. It cannot be said that sometimes He is, and sometimes He is not. He always is, and is one and the same. What, then, does "in Him Yes and in Him Amen" mean? By these words he shows that God's promises will unfailingly come to pass. Their existence and fulfillment depend on God, not on man. Therefore there is nothing to fear. It is not a man who promises, whom one might suspect of unfaithfulness. It is God, who speaks and acts. "To the glory of God, through us." What does "to glory through us" mean? He will fulfill His promises through us, that is, by pouring out His benefits upon us, to His glory. This is the meaning of "to the glory of God." If the fulfillment of the promises serves God's glory, then they will unfailingly be fulfilled. For God cannot disregard His own glory, even if He were to disregard our salvation. Yet He cannot disregard it because of His boundless love for mankind. Moreover, our salvation is closely joined to His glory, which is revealed in the fulfillment of His promises. Therefore, if the fulfillment of the promises serves God's glory, then certainly our salvation will also be accomplished. The Apostle constantly teaches the same in the Epistle to the Ephesians, when he says, "to the praise of His glory" (Eph 1:14). Everywhere he uses such expressions because he wishes to show the necessity of the fulfillment of God's promises. He says the same here. God's promises are immutable, since their fulfillment serves not only our salvation, but also God's glory. "Therefore," he says, "do not be troubled that these promises have been proclaimed through us. Do not doubt the faithfulness of their fulfillment. Their fulfillment does not depend on us, but on God, to whom they belong. For we announced to you not our own promises, but His."