Chapter 2 Negation
2.1 to 2.4 Sruti (Br Up 2.3.6) says: Not this, not this. Self is the left over after negation of everything, i.e., objects of experience. As they are mithyA and changing, they are negated to realize the unchanging remainder. This remainder, the negator cannot be negated. It is the Self and is of the nature of consciousness. It is the true nature of the negator. Self cannot be negated because it is based on pramAna (evidence). Self is the ultimate subject and is the reality. It has an independent existence. Objects are non-Self and are mithyA.
Upadesa SAhasrI (Part 3)
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