Acharya Prashant explains that a Guru is someone who is of ultimate benefit to the disciple and understands their state of mind because they have experienced the same levels of existence. A Guru exists on two planes: the disciple's plane and the transcendental plane. Because the Guru has walked the same path as the disciple, they can instantly sense the disciple's thoughts, emotions, and mental conditions. If the Guru were not on the disciple's level, they could not help; if they were only on that level, they could not provide a solution. The Guru is described as both useful and dangerous because they can see through all pretenses and uncover hidden truths, much like a doctor who reveals the true cause of an illness regardless of a person's social standing. Acharya Prashant notes that people often avoid the Guru to hide their inner 'diseases' or secrets, as the Guru reveals the real face behind the mask. Ultimately, the Guru's familiarity with the fundamental human tendencies of fear and ego allows them to recognize the disciple's true condition, making it impossible to hide anything from them.