Self, so when an aspirant’s attachment to his body is being removed through enquiry, he [i.e. the ego] will feel that he is going to die, hence some aspirants experience during their sadhana a fear of death and sometimes even a physical shaking or great heat, and so in this verse Sri Bhagavan clears the aspirant’s doubts and explains these phenomena.
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The only worthy occupation is to thoroughly absorb the ego by turning Selfward and, without allowing it to rise, to thus abide quietly, like a waveless ocean, in Self-Knowledge, having annihilated the delusive mind-ghost, which had been wandering about unobstructed.
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The truly powerful tapas is that state in which, having lost the sense of doership, and knowing well that all is His Will, one is relieved from the delusion of the foolish ego. Thus should you know.