David therefore himself calleth him Lord; and whence is he then his son? - There is but one solution of this difficulty. Messiah is at once inferior to David as his son according to the flesh, and superior to him as the Lord of a kingdom of which David is himself a subject, not the sovereign. The human and divine natures of Christ, and the spirituality of His kingdom - of which the highest earthly sovereigns are honored if they be counted worthy to be its subjects - furnish the only key to this puzzle.
And the common people - the immense crowd.
heard him gladly - “And no man was able to answer Him a word; neither durst any man from that day forth ask Him any more questions” (Mat 22:46).