This prana is born of Atman. As a shadow is cast by a person, so this prana is, by Atman. Through the activity of the mind it comes into this body.
— Prashna Upanishad 3.3
The mind and prana are the same, having the same source. If one is controlled, the other is also controlled at the same time. The aim is to make the mind one-pointed.
— Ramana Maharshi