The Yogis have learnt very much about the secret of breath from the serpent; that is why they regard the serpent as the symbol of wisdom. Shiva, the Lord of Yogis, has a serpent around his neck as a necklace. It is the sign of mystery, of wisdom. There are cobras in the forests of tropical countries, specially in India, which sleep for six weeks; and then one day the cobra wakens, and it breathes because it is hungry; it wants to eat. And its thoughts attract food from wherever it may be; food is attracted from miles away by its thoughts. The breath of the cobra is so magnetic that the food is helplessly drawn; a fowl, or a deer or some other animal is drawn closer. It is so strongly drawn that it even comes down from the air, and falls into its mouth. The snake makes no effort. It just breathes; it opens its mouth, and its food comes into its mouth. And then it rests again for six weeks.