Each and every thing, or being, including man, takes shelter under it. Prana is the fundamental energy and the source of all knowledge. Prana and citta are in constant contact with each other. They are like twins. Prana become focussed where citta is, and citta, where prana is.
Yoga suggests that as long as the breath is still, prana is still, and hence citta is still.
All types of vibrations and fluxuations come to a standstill when prana and citta are steady and silent. Because of this connection between breath and consciousness, yoga has devised pranayama to stabilize energy and consciousness. In this image, the prana streams out from the center through the whole body. Pranayama is the measuring, control, and directing of the breath, and thus of energy within the organism, in order to restore and maintain health and to promote evolution. When you are troubled, restless, or confused, you have more prana outside the body than within.