Can you explain the significance of true devotion to the Guru and its rewards based on Chapter 46?

Chapter 46 of the Sai Satcharitra extols the supreme greatness of heartfelt devotion to the Guru. It states that when devotion is performed with one's whole heart and soul, the qualities of Peace, Detachment, and even Fame remain under the devotee's control. The chapter poses a rhetorical question: what could a person with such devotion possibly lack? It assures that whatever they desire in their heart, they will obtain without any effort. In a powerful statement on the supremacy of devotion, the text claims that even the state of Brahman-realization serves such a devotee like a maid-servant, and that liberation is not something they even need to ask for.