Based on Chapter 45, what is the connection between a Guru's mercy and a devotee's life, and how was the Satcharitra itself initiated?

Chapter 45 clearly states that a devotee's life is transformed by the Guru's mercy, which makes worldly existence happy and renders the impossible possible. The chapter begins by highlighting the Guru's extraordinary skill, explaining that He initiated the writing of the Satcharitra while "effortlessly sitting and grinding grain." This act is seen as the Guru's way of setting His devotees on the true path. The author humbly refers to the book as a "speech-sacrifice" (Vag-yagna), suggesting that it is a sacred offering that the Guru Himself is responsible for completing, underscoring the divine origin and purpose of the text.