How do we know that the Self is separate from the body? Kathopanishad clarifies that man does not live purely because he breathes. Instead, Swami Tejomayananda elaborates on what causes bodies to function.  In every body, there is an individual jiva. When the jiva leaves the body, what remains? The functions of the body stop. This implies that there is something other than the body that causes it to function. The physical, physiological and senses work only because they are enlivened by Him, clarifying that the Atmatattva is separate from the body.

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