According to Chapter 45, what is the role of the Guru in achieving the ultimate spiritual goal, and how does this relate to self-reliance?

According to Chapter 45, the Guru plays a pivotal role as the embodiment of the eternal, described as the "true Brahman" and a "solid mass of Brahman-consciousness." The prescribed path is to renounce the transient world and meditate solely on the Guru. However, the text also places immense importance on self-reliance. It states that a seeker must give up hope in others, maintain strong self-confidence, and "gird up his own loins." Ultimately, spiritual achievement comes to the one who practices discrimination between the eternal and transient and relies on their own self, while using the Guru as the focal point of their meditation.