So closely is health related to our happiness that we cannot have the latter without the former. A practical knowledge of the science of human life is necessary in order to glorify God in our bodies. It is therefore of the highest importance, that among the studies selected for childhood, physiology should occupy the first place. How few know anything about the structure and functions of their own bodies, and of nature's laws! Many are drifting about without knowledge, like a ship at sea without compass or anchor; and what is more, they are not interested to learn how to keep their bodies in a healthy condition and prevent disease.—Counsels on Health, 38. CME 33.4