Acharya Prashant explains Kabir Saheb's couplet regarding the persistence of doubt despite reading, hearing, and learning. He states that the fundamental doubt is always whether the spiritual path is right for the individual and if it will cause personal loss. He clarifies that this fear is justified because the spiritual path will indeed cause the loss of one's current self and ego. This is why scriptures were traditionally restricted to those with the right eligibility; without the proper readiness, even the highest knowledge acts like a wasted ultimate weapon, leaving no further hope for the seeker.