The relation which exists between the mind and the body is very intimate. When one is affected, the other sympathizes. The condition of the mind affects the health of the physical system.

By sin we have been severed from the life of God. Our souls are palsied. Of ourselves we are no more capable of living a holy life than was the impotent man capable of walking. Many realize their helplessness; they are longing for that spiritual life which will bring them into harmony with God, and are striving to obtain it. But in vain. In despair they cry, "O wretched man that I am! who shall deliver me from this body of death?" Romans 7:24, margin. Let these desponding, struggling ones look up. The Saviour is bending over the purchase of His blood, saying with inexpressible tenderness and pity, "Wilt thou be made whole?" He bids you arise in health and peace. 

- Ministry of Healing, p.85