David therefore calleth him Lord, how is he then his son?

David, then, doth call him lord, and how is he his son?'

"David himself therefore calls Him Lord, and how can He be his son?"

David then gives him the name of Lord, so how is it possible for him to be his son?

David, then, calls him 'lord,' so how is he David's son?"

David therefore called him Lord,.... Or, "my Lord", as the Syriac and Ethiopic versions read; or, "his Lord", as the Arabic version. This is the inference from the words before cited Psalm 110:1, upon which the following question is asked,
how is he then his son? how can these things be reconciled? in what sense can he be both his Lord and son? See Gill on Matthew 22:45.