How does Chapter 10 describe the power of a Sadguru and the benefits of serving one?

According to Chapter 10, the Sadguru is depicted as the one eternal God who can alter one's destiny, metaphorically 'striking a nail over the lines of destiny.' Serving the Sadguru is presented as the best means for spiritual progress, costing nothing yet yielding great fruit. The text states that for devoted bhaktas, the Guru acts as a boatman to cross the 'ocean of existence,' destroying the three types of miseries. By the Guru's grace, devotees can have their attachments to sense objects vanish and their accumulated and current karmas destroyed, ultimately attaining liberation effortlessly.