Mind is ever changing. You feel happy now. In the next second you feel miserable. The mind is active now. The next moment, it becomes dull and inactive. It is pure now. The next second it is filled with anger and lust. The mind undergoes various transformations. There must be a basis or substratum which does not undergo any change. Just as there is substratum rope for all the changing, illusory appearances as snake, garland, stick, etc., so there is the changeless Atman or Brahman, for this everchanging mental phenomena. This changeless, continuous Atman connects all the states of the mind, all the changes in the body, the three Avasthas or states. Then alone memory is possible. Atman is a great synthetic Unifier.
I. ATMAN IS THE WITNESS
Annihilate such ideas, - This is mine, - That is mine, which spring from the identification of the Self with the body, mind, etc., and which cause bondage and attachment. Identify yourself with the non-dual Brahman, which will relieve you of the fear of death and which will bestow Immortal Bliss. Know the Self as the witness of the mind and the three states: waking, dreaming and deep sleep.
II. MIND ALONE SEES AND HEARS
Mind alone sees, hears and tastes. I had my mind engaged elsewhere; so I did not see. I had my mind engaged elsewhere; so I did not hear. This is the experience of all. Wherever there is the mind, there is the sense. Wherever there is no mind, there is no functioning of the mind. If the mind is not linked to the ear, you cannot hear the recitation of the Gita. If the mind is not linked to the eye, you cannot see an object. Hence mind exists. If anybody touches your back, you feel particularly the touch of the hand and fingers. The eye does not see the spot. The skin can only feel the hardness or softness of the touch. The mind alone is the cause of this knowledge. Mind alone really feels the touch.
III. MIND, THE SYNTHETIC ORGAN
Eye can only see colours. Ear can only hear sounds. Eye cannot do the function of ear, but the mind hears, sees, etc. It can do the functions of all the senses. It is a synthetic organ. It unifies, collects and synthesises. It is a great unifier. It is like the administrator or office-superintendent. It supervises the functions of the ten organs. Body is made of several parts viz., hands, fingers, legs, toes, chest, hip, etc. It is the mind that connects itself with all the parts of the body. If there is a pinprick in the inert body, at once it feels.