What does Chapter 12 teach about the power and function of a Sadguru in a devotee's life?

According to Chapter 12, a Sadguru is a powerful and compassionate guide who helps devotees navigate worldly existence. The chapter describes the Guru as the "Agastya for the ocean of worldly existence" and the "sun for the darkness of ignorance." It is explained that saints like Sai Baba spend their accumulated merits, drawn by the love of their devotees, and will leap over any obstacle for their sake. Their function is to instill firm faith, which is presented as the key to salvation. By placing faith at the Guru's feet, even an ignorant person's ignorance is destroyed, allowing them to overcome life's crises.