"The Self carries himself twofold, as the life-force (Prana) and as the Sun. Two are his paths within and without by which he revolves by day and by night. The Sun is the outer Self; the life-force is the inner Self. Hence by the movement of the outer Self, the movement of the inner Self is measured. But according to the Knower, who is free of sin, whose eye is turned within, it is by the movement of the inner Self that the movement of the outer Self is measured (MaiU VI. 1)."