Charles H. Spurgeon on Psalms 107:19

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.