Yet for this reason the "remnant" among them was all the more worthy. For its sake the others were endured, although, according to Josephus, they were very unworthy of this because of their corruption.
Thus the addition to the "remnant" that was to be accomplished through the calling of the Gentiles became a kind of new ground for the rejection of the Hebrews.
Without them there was found that great "seed," like the sand of the sea, concerning which the promise had been given to Abraham.
Therefore the Apostle's main thought, for which he cites prophetic predictions about the salvation of the believing remnant and the calling of the Gentiles, aims to show something with still greater force.
God's promise cannot be considered unfulfilled merely because some Jews were not vouchsafed the spiritual blessings indicated in the promise to their fathers.
Those blessings were inherited in Christ by believing Jews and by Gentiles who turned to the Lord. According to Blessed Theodoret, "The Apostle brought forward these testimonies to make known that the God of all foresaw from the beginning both those who would approach faith and those sick with unbelief.
Since the Jews, unreasonable and blinded, said that few of them accepted the preaching, while all the rest fled from it as deception, he showed that this had been foretold of old.
Not all would obtain salvation, but only those adorned with faith." The indication of faith is seen in Isaiah's prophetic word: "a shortened word."
"The prophet called faith a shortened word. What the law taught by many commandments and could not grant as perfect salvation, the confession of Christ accomplished. Faith provided this.
Faith is shortened and has no need of lengthy circuits. It is judged by the disposition of the soul and preached by the tongue." "As Saint John Chrysostom says, it contains salvation in few words.
For the Apostle says, 'If you confess with your mouth the Lord Jesus and believe in your heart that God raised Him from the dead, you will be saved' (Rom 10:9)."
Why many Jews did not have saving faith, and were therefore rejected, the Apostle explains further on (Rom 9:30-10:21).