So then right fitly Christ says through David that He converses with the Father; and right worthily does He say the other things concerning Himself through the prophets; as in other instances, so also after this manner by Isaiah:

And now thus saith the Lord, who formed me as his servant from the womb, to gather Jacob and to gather Israel unto him: and I shall be glorified before the Lord, and my God shall be a strength unto me. And he said: A great thing shall it be to thee to be called my servant, to stablish and confirm the tribe of Jacob, and to turn again the dispersion of Israel: and I have set thee for a light of the Gentiles, [188] that thou shouldst be for salvation unto the end of the earth.