Behind the word is a much greater power: breath. If a person wishes to study the self, to know the self, what is important is not the study of mind, thought, and imagination, nor of the body, but the study of breath. The breath has made the mind and the body for its expression. It has made all, from the vibration to the physical atom, from the finest to the grossest. The breath, a change of breath, can make us sad in the midst of happiness, it can make us joyful in the saddest, the most miserable surroundings. That is why without reason in some places we feel glad, in other places a melancholy comes over us. It is the air that makes us so. One may say, "How can breath do all this? How can it make the body?" I have seen people in the course of years become as their breath is. What exists in the breath is expressed in the form: as the breath is, so the child becomes.