When the five organs of perception become still, together with the mind, and the intellect ceases to be active: that is called the highest state. The teacher now shows Nachiketas the process by which the transcendental vision can be attained. he out-going senses,--seeing, hearing, smelling, touching, tasting; the restless mind and the intellect: all must be indrawn and quieted. The state of equilibrium thus attained is called the highest state, because all the forces of one's being become united and focused; and this inevitably leads to supersensuous vision. XI This firm holding back of the senses is what is known as Yoga. Then one should become watchful, for Yoga comes and goes. Yoga literally means to join or to unite the lower self with the Higher Self, the object with the subject, the worshipper with God. In order to gain this union, however, one must first disunite oneself from all that scatters the physical, mental and intellectual forces; so the outgoing perceptions must be detached from the external world and indrawn. When this is accomplished through constant practice of concentration and meditation, the union takes place of its own accord. But it may be lost again, unless one is watchful. XII He cannot be attained by speech, by mind, or by the eye. How can That be realized except by him who says "He is"? 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. XVII