And said, If thou wilt diligently hearken to the voice of the LORD thy God, and wilt do that which is right in his sight, and wilt give ear to his commandments, and keep all his statutes, I will put none of these diseases upon thee, which I have brought upon the Egyptians: for I am the LORD that healeth thee. Exodus 15:26

Christ had been the guide and teacher of ancient Israel, and He taught them that health is the reward of obedience to the laws of God. The Great Physician who healed the sick in Palestine had spoken to His people from the pillar of cloud, telling them what they must do, and what God would do for them. Christ gave to Israel definite instruction in regard to their habits of life, and He assured them, “The Lord will take away from thee all sickness” (Deuteronomy 7:15). When they fulfilled the conditions, the promise was verified to them. “There was not one feeble person among their tribes” (Psalm 105:37). These lessons are for us. There are conditions to be observed by all who would preserve health. All should learn what these conditions are. The Lord is not pleased with ignorance in regard to His laws, either natural or spiritual. We are to be workers together with God for the restoration of health to the body as well as to the soul. And we should teach others how to preserve and to recover health. For the sick we should use the remedies which God has provided in nature, and we should point them to Him who alone can restore. It is our work to present the sick and suffering to Christ in the arms of our faith. We should teach them to believe in the Great Healer. We should lay hold on His promise, and pray for the manifestation of His power. The very essence of the gospel is restoration, and the Savior would have us bid the sick, the hopeless, and the afflicted take hold upon His strength. The power of love was in all Christ’s healing, and only by partaking of that love, through faith, can we be instruments for His work. If we neglect to link ourselves in divine connection with Christ, the current of life-giving energy cannot flow in rich streams from us to the people…. To take His yoke is one of the first conditions of receiving His power. The very life of the church depends upon its faithfulness in fulfilling the Lord’s commission. To neglect this work is surely to invite spiritual feebleness and decay. Where there is no active labor for others, love wanes, and faith grows dim.—The Desire of Ages, 824 & 825.