From a commentary on the psalms by Saint Augustine, bishop
Jesus Christ prays for us and in us and is the object of our prayers God could give no greater gift to men than to make his Word, through whom he created all things, their head and to join them to him as his members, so that the Word might be both Son of God and son of man, one God with the Father, and one man with all men. The result is that when we speak with God in prayer we do not separate the Son from him, and when the body of the Son prays it does not separate its head from itself: it is the one Saviour of his body, our Lord Jesus Christ, the Son of God, who prays for us and in us and is himself the object of our prayers. He prays for us as our priest, he prays in us as our head, he is the object of our prayers as our God. Let us then recognise both our voice in his, and his voice in ours. When something is said, especially in prophecy, about the Lord Jesus Christ that seems to belong to a condition of lowliness unworthy of God, we must not hesitate to ascribe this condition to one who did not hesitate to unite himself with us. Every creature is his servant, for it was through him that every creature came to be.
From universalis.com, Office of Readings