XIII
He should be realized as "He is" and also as the reality of both (visible and invisible). He who knows Him as "He is," to him alone His real nature is revealed.
This supersensuous vision cannot be gained through man's ordinary faculties. By mind, eye, or speech the manifested attributes of the Divine can be apprehended; but only one who has acquired the supersensuous sight can directly perceive God's existence and declare definitely that "He is," that He alone exists in both the visible and the invisible world.
XIV
When all desires dwelling in the heart cease, then the mortal becomes immortal and attains Brahman here.
XV
When all the ties of the heart are cut asunder here, then the mortal becomes immortal. Such is the teaching.
XVI
There are a hundred and one nerves of the heart. One of them penetrates the centre of the head. Going upward through it, one attains immortality. The other (hundred nerve-courses) lead, in departing, to different worlds.
The nervous system of the body provides the channels through which the mind travels; the direction in which it moves is determined by its desires and tendencies. When the mind becomes pure and desireless, it takes the upward course and at the time of departing passes out through the imperceptible opening at the crown of the head; but as long as it remains full of desires, its course is downward towards the realms where those desires can be satisfied.