Albert Barnes Commentary Matthew 12:23

"And all the multitudes were amazed, and said, Can this be the son of David?" — Matthew 12:23 (ASV)

Is not this the Son of David? That is, is not this the promised descendant of David, the Messiah? They were acquainted with the prophecy in Isaiah 35:5, Then the eyes of the blind shall be opened, and the ears of the deaf shall be unstopped; and they inferred that he must be the promised Messiah who should be able to do this. This inference was drawn by the common people, and not by the proud and haughty Pharisees.

It is not uncommon that people of plain common sense, though unlearned, see the true beauty and meaning of the Bible, while those who are filled with pride and science, falsely so called, are blinded.