“From the first dawn of reason the human mind should become intelligent in regard to the physical structure. We may behold and admire the work of God in the natural world, but the human habitation is the most wonderful.... It is therefore of the highest importance that among studies selected for childhood, physiology should occupy the first place..... All children should study it. It should be regarded as the basis of all educational effort. And then parents should see to it that practical hygiene be added.”—Healthful Living, 13. PH140 17.1