“When the soul is diseased we usually feel no pain. But if the body suffers only a little, we make every effort to be free of the illness and its pain. Therefore, God corrects the body for the sins of the soul, so that by chastising the body, the soul might also receive some healing… Christ did this with the Paralytic when He said: Behold, thou art made whole; sin no more, lest a worse thing come unto thee. What do we learn from this? That the Paralytic’s disease had been produced by his sins”
(St. John Chrysostom, Homily on John)