According to the preface of the Shri Sai Satcharita, what is the path to attaining true knowledge?

The preface explains that the path to attaining true knowledge lies in dedicated service to a Sadguru or saints. As detailed in Chapter 0, this principle is ancient, dating back to Vedic times. The text cites Lord Samarth Sadguru Dnyaneshwar Maharaj, who stated, "If you desire to bring that beautiful knowledge into your mind, then serve the saints with your entire being." This service, performed with body, mind, and soul and without ego, is described as the very doorway to the treasure of knowledge.