How does Chapter 10 describe the power of a Sadguru and the benefits of placing one's faith in them?

Chapter 10 explains that a Sadguru is the one eternal God, while other gods are illusory. By placing faith in a Sadguru's feet, one's destiny can be fundamentally altered, as the text says He "strikes a nail over the lines of destiny." The chapter further elaborates that pure service to the Sadguru destroys the worldly existence (Samsara) and helps devotees cross over the three types of miseries. Just as one trusts a boatman to cross an ocean, Chapter 10 advises trusting a Guru to cross the ocean of existence, who then effortlessly places Knowledge and liberation in the devotee's hands.