Matthew 9:6

“But that ye may know that the son of man, etc.] That they might have a visible proof, an ocular demonstration, that though he was the son of man, truly and really man, yet not a mere man; but also as truly and properly God, God and man in one person, and so hath power on earth to forgive sins: not only ability as God, but even authority to do it as mediator, even whilst he was on earth, in a state of humiliation, in fashion as a man, in the form of a servant, conversing with sinful mortals. Then saith he to the sick of the palsy; turning himself from the Scribes, unto him, and without putting up any prayer to God, but by a mere word of command, says to him, arise, take up thy bed, and go…”

“But that ye may know ... - That you may have full proof on that point; that you may see that I have power to forgive sin, I will perform an act which all must perceive and admit to require the power of God. Arise, take up thy bed, and go unto thine own house - The fact that the paralytic man could do this would prove that a miracle was performed. He was healed by a word; it was done instantaneously; it was done in the most public manner. The fact that a man, just before perfectly helpless, could now take up and carry his own bed or couch, proved that a divine “power” had been exerted; and that fact proved that he who had performed the miracle must also have the “power” and the “authority” to…”

“On earth - Even in my state of humiliation. Matthew 9:8”

“9:6 So I will prove: Jesus performed the miracle to reveal his authority and identity as God’s Messiah (see 11:2-6; 12:28).”

“that the: Isa 43:25; Mic 7:18; Mar 2:7, Mar 2:10; Luk 5:21; Joh 5:21-23, Joh 10:28, Joh 17:2; Joh 20:21-23; Act 5:31, Act 7:59, Act 7:60; Co2 2:10, Co2 5:20; Eph 4:32; Col 3:13 Arise: Mat 9:5; Luk 13:11-13; Act 9:34 Matthew 9:8”