The Witness body is also invisible to the naked eye, and is the part of yourself that is pure consciousness, this is the seat of wisdom - essentially your soul in pure form.
This is the part of your body that recognizes that you see a cup, and that you are not a cup, or more relevant to our topic of purification, ‘I realize that I am having an angry feeling/emotion, yet I distinguish that I am not an angry being/person.’
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