Health is the ability of a biological system to acquire, convert, allocate, distribute, and utilize energy with maximum efficiency. The World Health Organization (WHO) defined human health in a broader sense in its 1948 constitution as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." This definition has been subject to controversy, in particular as lacking operational value, the ambiguity in developing cohesive health strategies and because of the problem created by use of the word "complete", which makes it practically impossible to achieve. Other definitions have been proposed, among which a recent definition that correlates health and personal satisfaction.
Safety is the state of being "safe" (from French sauf), the condition of being protected from harm or other non-desirable outcomes. Safety can also refer to the control of recognized hazards in order to achieve an acceptable level of risk.
You must all advance by taking good care of your health. Only by taking good care of your health, you can gain success. The fact is that if your health is not good, how can you do your service? Taking care of your health is as important as any of the other duties of your life. It is your duty towards your body. If your body does not work, how will you function and advance?
Haidakhan Babaji, The Teachings of Babaji, 9 January 1984.