41 Then, surrounded by the Pharisees, Jesus asked them a question: 42 "What do you think about the Messiah? Whose son is he?" They replied, "He is the son of David." 43 Jesus responded, "Then why does David, speaking under the inspiration of the Spirit, call the Messiah 'my Lord'? For David said, 44 'The said to my Lord, Sit in the place of honor at my right hand until I humble your enemies beneath your feet.' 45 Since David called the Messiah 'my Lord,' how can the Messiah be his son?" 46 No one could answer him. And after that, no one dared to ask him any more questions.
Matthew Henry's Commentary on Matthew 22:41-46
Commentary on Matthew 22:41-46
(Read Matthew 22:41-46)
When Christ baffled his enemies, he asked what thoughts they had of the promised Messiah? How he could be the Son of David and yet his Lord? He quotes Psalm 110:1. If the Christ was to be a mere man, who would not exist till many ages after David's death, how could his forefather call him Lord? The Pharisees could not answer it. Nor can any solve the difficulty except he allows the Messiah to be the Son of God, and David's Lord equally with the Father. He took upon him human nature, and so became God manifested in the flesh; in this sense he is the Son of man and the Son of David. It behoves us above all things seriously to inquire, "What think we of Christ?" Is he altogether glorious in our eyes, and precious to our hearts? May Christ be our joy, our confidence, our all. May we daily be made more like to him, and more devoted to his service.