What are the main themes discussed in Chapter 45 of the Shri Sai Satcharitra regarding the Guru's power and legacy?

Chapter 45 delves into the profound significance of the Guru, stating that the Guru's feet are even more powerful than Moksha, the supreme goal of man. It explains that if the Guru becomes merciful, worldly life becomes happy and the impossible becomes possible. The chapter then laments the physical departure of Sai Baba, whose form brought contentment and removed the fear of worldly existence. However, as Chapter 45 clarifies, His legacy endures through His literary form, this very book, which provides remembrance. Listening to these stories with a concentrated mind is described as a supremely holy act that brings a unique and indescribable peace.