According to the beginning of Chapter 42, what is the role and significance of a Sadguru's grace in a devotee's life?

As introduced in Chapter 42, the Sadguru is portrayed as a supreme figure, the 'Great Giver' who shows devotees the way to cross the river of worldly existence. The text describes the Sadguru as a 'Wish-fulfilling Tree' (Kalpataru) for his followers. By the power of the Guru's grace, the fear and distress of worldly life are removed, and the path to ultimate liberation is opened. The chapter states that by constantly remembering the Sadguru's feet, obstacles dissolve, unhappiness turns to happiness, and even the sorrows of worldly life are forgotten, leading to great holiness.