Prana, according to the Vedanta, is the principle of life. It is like ether, an omnipresent principle; and all motion, either in the body or anywhere else, is the work of this Prana. It is greater than Akasha, and through it everything lives. Prana is in the mother, in the father, in the sister, in the teacher, Prana is the knower.
Lectures on Jnâna Yoga (ed. 1902)