Sickness is From Sin. Healing is From the Cross.

If sickness has come into the world through sin, which is conceded, it must be got out of the world through God’s great remedy for sin, the cross of Jesus Christ.

If sickness is only a natural condition it may be met by natural means, but if it be abnormal, and but a stage of death, which has passed upon all because all have sinned, then its divinely appointed remedy is the atonement of Jesus Christ, which God has set over against all the effects of the fall.