The basic problem of every living creature is survival in a hostile world. Countless generations ago, from the teeming human masses of the East, where the man lived in ever-present dread of famine, disease, flood, invasion, and vengeance of the gods, Yoga, a system or method of attaining physical and mental serenity under adverse and even horrible conditions, was introduced. Man, in his essence, has changed little in the course of historical time. The philosophy .