Acharya Prashant explains that the witness is the absolute truth and cannot be an object of description, thought, or imagination. He clarifies that if the witness is truly a witness, it remains unseen and cannot be talked about or conceived by the mind. He criticizes the casual and liberal use of the term 'witness' in spiritual circles, noting that the ego often tries to turn the sacred into a thing of consciousness or a fairytale. He emphasizes that the witness is not something one can claim to see or know as an object, as that would imply another witness observing it, leading to an infinite regress.