See the note on Matthew 22:41-46, where this paragraph is explained. And the common people heard him gladly They heard him with great attention and pleasure; for the clear and solid answers which he returned to the insnaring questions of his foes, gave them a high opinion of his wisdom, and showed them how far he was superior to their most renowned rabbis; whose arguments to prove their opinions, and answers to the objections that were raised against them, were, generally speaking, but mean and trifling in comparison of his. Besides, the common people were neither so much prejudiced in behalf of the commonly received opinions, nor so much interested, as the scribes or other teachers.
Related Commentaries of Mark 12:35
Mark 12:35-37
35 And Jesus answered and said, while he taught in the temple,How say the scribes that Christ is the Son of David?
36 For David himself said by the Holy Ghost, The LORD said to my Lord, Sit thou on my right hand, till I make thine enemies thy footstool.
37 David therefore himself calleth him Lord; and whence is he then his son? And the common people heard him gladly.