John Chrysostom
"In hope of eternal life." Having spoken of the present life, ordered according to God's grace, he also speaks of the future, presenting rewards for that by which the Lord has benefited us.
Because we believed and were delivered from error, God desires to crown us.
Do you see how the very opening is filled with references to God's benefactions? This whole epistle proves to be chiefly of this kind, encouraging both the saint himself, Titus, and his disciples to greater labors.
Nothing is so beneficial for us as the constant remembrance of God's benefactions, both common and particular.
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If, after receiving a benefaction from a friend, hearing a pleasant word from him, or receiving a good service, we become more warmly attached to him, then much more will we be zealous in obedience to God.
This happens when we see in what dangers we were, and from what dangers He delivered us.
"And the knowledge of the truth." He speaks here of truth in contrast to prefiguration. That too was knowledge and piety, but not of the truth.
In any case, it was not falsehood, but only images of the truth and likenesses of it.
The Apostle rightly said, "in hope of eternal life," because that piety was in hope of the present life. "The man who does it," Scripture says, "shall live by it" (Rom 10:5).
Do you see how, from the very opening, he shows the difference between grace and the Law? They are not the elect, but we are.
If they were once called elect, now they are no longer so.
"Which God, unchanging in His word, promised before eternal times," he says. That is, not now because of our repentance, but this was predestined from the beginning.
He affirms the same in many other places, for example, "set apart for the Gospel of God" (Rom 1:1). Again, "whom He foreknew, He also predestined" (Rom 8:29).
He indicates our nobility, namely, that God loved us not now, but from the beginning. To be loved from of old and from the beginning is no small thing.
"Which God, unchanging in His word, promised." If God does not lie, then what He promised will certainly be fulfilled. If He does not lie, we must not doubt, even if this is fulfilled only after death.
"Which God, unchanging in His word, promised before eternal times." By the words "before eternal times," the Apostle also shows the trustworthiness of the promise.
He says that this did not happen because the Jews did not turn to Him now, but that it had been marked out beforehand from of old.