John Chrysostom

If then you disbelieve the first, (i. e. the forgiveness of sins,) behold, I add another, seeing that I lay open your inmost thoughts. Again, another that I make whole the body of the palsied man. Hence He adds, Whether is it easier? It is very plain that it is easier to restore the body to health. For as the soul is far nobler than the body, so is the forgiveness of sins more excellent than the healing of the body. …

Catena Aurea by Aquinas ↗

Bede

What is easier to say, "Your sins are forgiven," or to say, "Rise and walk"? Whether the paralytic's sins were forgiven, only He who forgives them knows. But "rise and walk," both he who rises and those who see him rising can confirm. Therefore, a physical sign is performed to prove the spiritual one.

On the Gospel of Luke ↗

Bonaventure

There is added thirdly the refutation of errors of those thinking wrongly, in what follows: Which is easier to say etc. For he constructs an argument in which he shows that he is true God and can forgive sins, and consequently that they err. And the argument is as follows: everyone who can free a paralytic by a word alone can by a word alone forgive sins. Of this reasoning, however, he first sets forth the proof of the major proposition, subjoins the assumption and interposes the conclusion. …

Commentary on Luke, Chapter 5 ↗