Breath has various works to do in the mechanism of the body. Hunger and thirst, the power of eating and drinking, is given by the breath; the closing and opening of the eyes, and the activity of all the organs is directed by the power of the breath; the expelling of all gases and excrements also is directed by the breath. Therefore every activity of the body, outward and inward, is directed by the breath. Therefore it is disorder of the breath which causes illness, and its order regulates the health. Many physicians now point out reasons for diseases, where mystics think of the breath and point out reasons in breathing. According to the point of view of the mystic a natural full breath gives perfect health, and to a mystic's view in a hundred people not one breathes rightly. Every Brahmin teaches his child a way of breathing when he is nine years old. As it is a common thing that everybody breathes incorrectly it rarely occurs to the mind that one's breath is incorrect.