While the Pharisees were gathered together, Jesus asked them, “What do you think about the Messiah? Whose son is he?”

“The son of David,” they replied.

He said to them, “How is it then that David, speaking by the Spirit, calls him ‘Lord’? For he says,

“‘The Lord said to my Lord:
    “Sit at my right hand
until I put your enemies
    under your feet.”’

If then David calls him ‘Lord,’ how can he be his son?” Matthew 22:41-45

            This topic came up with the Pharisees and Jesus.  The Pharisees knew the promised Messiah from the Old Testament prophecies would be born through the line of David.  So Jesus turned to a Psalm 110 and quoted David, asking how this Messiah could be David’s son yet he called him “Lord.”  The Pharisees were more focused on a human savior, born of a human line, rather than considering the possibility that this “son” could be God.  By using Psalm 110, Jesus focused on the Lord speaking to the Lord, a sign of the Trinitarian relationship of God with God.  This challenged their thinking that the Messiah could be both born of a human line (son of David) and God too.