Based on these passages, what is the ultimate method for breaking the bonds of worldly existence, and what is the Sadguru's role in this?

The text from Chapter 49 posits that the supreme means to break the bonds of worldly existence is devotion to the Sadguru, Sai Baba. It is explicitly stated that there is no other method, and that consuming the supremely purifying and pleasant stories of Sai is the way. This path requires complete surrender, as the text notes that without surrendering at the Sadguru’s feet, one's true form cannot be realized. The Sadguru is not just a guide but the ultimate object of devotion. Love for the Guru's feet is called our only true wealth, and meditation on the Guru is elevated above all other spiritual practices, including pilgrimages, sacrifices, and even the chanting of God's name.