3 Furthermore herein we ought either to perceive those things which were done by other enemies, before Christ had come in the flesh: at that time when there were even the holy prophets, when the carrying away into Babylon took place, and that nation was grievously afflicted, and at the time when under Antiochus also the Maccabees, having endured horrible sufferings, were most gloriously crowned. Or certainly if after the Resurrection and Ascension of the Lord the inheritance of God must be understood to be here spoken of; such things must be understood herein, as at the hands of worshippers of idols, and enemies of the name of Christ, His Church, in such a multitude of martyrs, endured....This Church then, this inheritance of God, out of circumcision and uncircumcision has been congregated, that is, out of the people of Israel, and out of the rest of the nations, by means of the Stone which the builders rejected, and which has become for the Head of the corner, in which corner as it were two walls coming from different quarters were united.
For Himself is our peace, who has made both one, that He might build two into Himself, making peace, and might unite together both in one Body unto God: in which Body we are sons of God, “crying, Abba Father.” Abba, on account of their language; Father, on account of ours. For Abba is the same as Father....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)