There is the law of rhythm behind good weather and bad weather; and it is the influence of the good or bad weather which, acting on the living beings, creates a similar result in their lives. Good weather gives a desirable rhythm to living beings, and bad weather brings about an undesirable result in their health. It would therefore not be an exaggeration to say with the ancient Yogis that birth and death, as well as the limited time which separates birth from death, are the fulfillment of a certain appointed rhythm. And if we go a little further in exploring this idea, then we shall see, as the ancient Yogis have seen, that by controlling this rhythm one can prolong one's life, and that by neglecting this rhythm one can also shorten it.