Theophylact of Ohrid

But though their thoughts were laid bare, still they remain insensible, refusing to believe that He who knew their hearts could forgive sins, wherefore the Lord proves to them the cure of the soul by that of the body, shewing the invisible by the visible, that which is more difficult by that which is easier, although they did not look upon it as such. For the Pharisees thought it more difficult to heal the body, as being more open to view; but the soul more easy to cure, because the cure is invisible; so that they reasoned thus, Lo, He does not now cure the body, but heals the unseen soul; if He had had more power, He would at once have cured the body, and not have fled for refuge to the unseen world. The Saviour, therefore, shewing that He can do both, says, Which is the easier? as if He said, I indeed by the healing of the body, which is in reality more easy, but appears to you more difficult, will prove to you the health of the soul, which is really more difficult.