How does the text define the Guru and what is meant by 'undifferentiated worship' (Abheda-bhajan)?

The text presents a profound definition of the Guru, stating that 'the Guru alone is the true Brahman.' As Chapter 45 explains, Brahman is eternal while the world is transient. By recognizing the Sadguru as a solid mass of Brahman-consciousness, a disciple can find the path to liberation. The means to achieve this is by renouncing the transient world and meditating solely on the Guru, which gives rise to dispassion (Vairagya). 'Undifferentiated worship' (Abheda-bhajan) is the state that follows, where divinity is then perceived in all beings, suggesting a non-dualistic form of worship where distinctions begin to dissolve.