פירוש על בבא קמא 169:5

Permission was given to doctors to heal - and we do not say that God harms and He Himself heals.

Why is there a need for double language? One might have thought that the verse speaks only of healing from human injury but illness that comes from heaven should not receive medical intervention lest it appear as though one is undermining the decree of the king. The Torah then comes and says it is fine.

Kol shekein: [All the more so] is it not good for me like this; as if you will be negligent with yourself, it will be a great disgrace for me - since they will call me an "ox that damages."