Acharya Prashant explains that while there can be many mediums of teaching, the ultimate Guru and the Soul are one and the same. He emphasizes that anything leading a person toward fundamental peace is a Guru, but for a Guru to be useful to a seeker, they must manifest in a form that can communicate in the seeker's language and quieten the mind. He clarifies that 'going within' does not mean finding a physical place inside, but rather understanding the one who creates divisions like 'inner' and 'outer.' True victory over the mind is achieved when one becomes indifferent to winning or losing, playing the game of life so intensely that the individual self dissolves before the result is even known.