Theophylact of Bulgaria
Therefore, whoever remains in this rule of new life according to the image of Christ, avoiding circumcision grown old and deprived of power, will attain peace with God. He will be freed from the sins that make God our enemy. He will be counted worthy of love for mankind, no longer subject to hatred as God's enemy. Rather, he will be granted mercy, since peace has come to him through the Cross and grace. Such people are Israel in the proper sense, as those who see God. Those who are not such, even if they are Israelites by descent, are falsely called so. Paul took this from David, who says: "Peace be upon Israel" (Ps 124:5).