Matthew 22:45

If David then call him Lord, how is he his son? It was allowed of a certain truth, that the Messias was to be the son of David. Christ shews them by David's own words, that he was the Lord as well as the son of David: and this is what they could not answer to. (Witham) --- Jesus Christ here inculcates to the Pharisees, that two natures must be admitted in the Messias; in one of which, viz. in his human nature, he is the son of David, and as such inferior to him; and in the other, viz. in his divine nature, he is the son of God, and consequently superior to David; whence this latter, by the inspiration of the Holy Ghost, justly calls him Lord. (Tirinus) --- Jesus Christ does not wish them to think that the Messias is not the son of David, but only wished to rectify their opinion concerning him. When therefore he asks how he is the son, he teaches them that he is not, after the manner they understand it, the mere Son, but what is much more, the Lord also, of David. (St. John Chrysostom, hom. lxxii.)