According to the commentary by Dnyaneshwar Maharaj cited in the text, what is the prerequisite for attaining true knowledge from saints?

Drawing from a commentary by Lord Samarth Sadguru Dnyaneshwar Maharaj cited in Chapter 0, the essential prerequisite for receiving true knowledge is dedicated service to the saints. Maharaj's verses state that service is the "doorway" to the "treasure of knowledge." To gain this knowledge, one must serve the saints with their entire being, surrendering at their feet with body, mind, and soul. A crucial component of this service is that it must be performed without ego. When this selfless service is offered, the saints will then impart the knowledge that enlightens the heart and ensures that doubts will not arise, leading to true understanding.