14. “Sin no more,” etc. From this it would appear his infirmity was the punishment of sin. Our Lord also in this showed His Omniscience. He knew the cause from which the man’s infirmity had sprung. Hence, in some cases, diseases are the punishment of sin. In other cases, God sends diseases to test His servants, to try their patience; thus to increase their merit and save them from sin, by chastening them in this life, as an antidote against sin.
John 5:14