We are in a world that is opposed to righteousness or purity of character, and especially to growth in grace. Wherever we look, we see defilement and corruption, deformity and sin. How opposed is all this to the work that must be accomplished in us just previous to receiving the gift of immortality! God's elect must stand untainted amid the corruptions teeming around them in these last days. Their bodies must be made holy, their spirits pure. If this work is to be accomplished, it must be undertaken at once, earnestly and understandingly. The Spirit of God should have perfect control, influencing every action. CH 20.2
The health reform is one branch of the great work which is to fit a people for the coming of the Lord. It is as closely connected with the third angel's message as the hand is with the body. The law of Ten Commandments has been lightly regarded by man; yet the Lord will not come to punish the transgressors of that law without first sending them a message of warning. Men and women cannot violate natural law by indulging depraved appetites and lustful passions, without violating the law of God. Therefore He has permitted the light of health reform to shine upon us, that we may realize the sinfulness of breaking the laws which He has established in our very being. CH 20.3
Our heavenly Father sees the deplorable condition of men who, many of them ignorantly, are disregarding the principles of hygiene. And it is in love and pity to the race that He causes the light to shine upon health reform. He publishes His law and its penalties, in order that all may learn what is for their highest good. He proclaims His law so distinctly, and makes it so prominent, that it is like a city set on a hill. All intelligent beings can understand it if they will. None others are responsible. CH 21.1