Based on Chapter 42, what is the transformative power of a Sadguru's grace in a devotee's life?

As detailed in Chapter 42, the grace of a Sadguru like Sai Baba has a profound, transformative effect. The chapter explains that by the light of the Guru's grace, the distress and fear associated with worldly existence are removed, and the door to ultimate liberation is opened. It states that through constant remembrance of the Sadguru's feet, immediate unhappiness turns into happiness, the very nature of obstacles dissolves, and 'even death shall meet its death'. This highlights the Guru's role in not just solving temporal problems but in fundamentally altering a devotee's relationship with life, sorrow, and mortality.