Why do the investigation?

Words are themselves an expression in duality. Therefore words by themselves can never describe the One Reality. They can at best be pointers to That. The Guru in whatever form may at best be the guide and point to the Reality. But the eventual "journey" must be done by the one wanting to realize his own Self. When a person is ill, he is the one who has to take the medicine. If someone else takes the medicine for you, it is of no use to you. Same way, if you are hungry, you have to eat the food to satisfy the hunger. Therefore, the investigation into one's own reality has to be done by himself. No one else can do it for him/her. Reading all the scriptures, or books on Advaita Vedanta, attending the sessions of a physical Guru are only guides and pointers to the Truth. Only by personal investigation, driven by an earnest desire, can one discover the Truth or the Reality of one's own true nature.