Describe how Chapter 45 explains the concept of the Guru as Brahman and how this leads to 'undifferentiated worship'.

Chapter 45 presents a profound metaphysical concept by identifying the Guru with the ultimate reality. The text states, "Brahman is eternal, the world is transient; the Guru alone is the true Brahman." The prescribed path for a seeker is to renounce the transient world and its attachments and to meditate exclusively on the Guru. This constant focus and devotion cultivate dispassion, or Vairagya. As Chapter 45 further clarifies, the Sadguru is described as a "solid mass of Brahman-consciousness." By internalizing this truth and meditating on the Guru as Brahman, a state is reached where divinity is perceived in all beings. This universal perception of the divine is what the scripture calls "undifferentiated worship" or Abheda-bhajan.