Psalms 107:19

If we knew no sin, we should know no sickness. Sinners are fools. They hurt their bodily health by intemperance, and endanger their lives by indulging their appetites. This their way is their folly. The weakness of the body is the effect of sickness. It is by the power and mercy of God that we are recovered from sickness, and it is our duty to be thankful. All Christ's miraculous cures were emblems of his healing diseases of the soul. It is also to be applied to the spiritual cures which the Spirit of grace works. He sends his word, and heals souls; convinces, converts them, makes them holy, and all by the word. Even in common cases of recovery from sickness, God in his providence speaks, and it is done; by his word and Spirit the soul is restored to health and holiness.

Then they cry unto the LORD in their trouble. They join the praying legion at last. Saul also is among the prophets. The fool lays aside his motley in prospect of the shroud, and betakes himself to his knees. What a cure for the soul sickness of body is often made to be by the Lord's grace! And he saveth them out of their distresses. Prayer is as effectual on a sick bed as in the wilderness or in prison; it may be tried in all places and circumstances with certain result. We may pray about our bodily pains and weaknesses, and we may look for answers too. When we have no appetite for meat we may have an appetite for prayer. He who cannot feed on the word of God may yet turn to God himself and find mercy.