Based on Chapter 49 of the Sai Satcharitra, what are the primary teachings about the nature of a Sadguru and the qualities of a true devotee?

Chapter 49 explains that a Sadguru's nature is inexpressible and unfathomable, to the point where even the Vedas grew weary of attempting to praise Him. The author suggests that true praise lies in silence. However, the chapter also describes the qualities of a genuine devotee. It teaches that to possess true 'Devotee-hood,' one must be completely devoid of ego and the arrogance that comes from knowledge or pride in one's body. The greatest spiritual practice, as stated in this chapter, is not pilgrimages or sacrifices, but the constant meditation on one's own Guru, who is the devotee's ultimate treasure.