82. The disciple said, How then am I who am changeless, the knower, as you say, of all the mental modifications, the objects of my knowledge?
83. The teacher said to him, I told you the right thing. The very fact (that you know simultaneously all the mental modifications) was adduced by me as the reason why you are eternally immutable.
This is the insight which is confirmed by the protphaenomenon of Deep Sleep or Sushupti which I have written about extensively. The disciple fascinated by the constantly changing contents of consciousness is identifying with this mutability. He takes his Self to be those contents that are somehow knowing themselves. If that were the case then the contents would be known sequentially and the problem of identity would devolve into a ‘binding problem’. How does that series of conscious states related to the various sense modes come together or know itself as a series (Hume). The teacher cuts through the starting point for complex Buddhistic theories of the self, skandhas etc., by reminding the disciple that all mental states/modifications are known simultaneously. I would add that they are attended to sequentially according to a practical hierarchy.
Not identifying with the contents of consciousness gives the sage’s personality that bright alertness and lack of fixity. There are no special states of mind for him to focus on. In the chapter on Abiding in the Self Astavakra declares:
A stage of life or no stage of life, meditation, control of mental functions - finding that these cause distraction to me, thus verily do I firmly abide.(Astavakra Samhita Chap.XII.7)