How does one progress from devotion to the Guru to the state of 'undifferentiated worship' as described in Chapter 45?

Chapter 45 outlines a clear progression to achieve 'undifferentiated worship' (Abheda-bhajan). The journey begins with the foundational understanding that Brahman is eternal while the world is transient, and, crucially, that the Guru is the true Brahman. The next step is to renounce the transient world and meditate solely on the Guru. This practice cultivates a state of dispassion, known as Vairagya. Through this focused meditation and dispassion, the seeker comes to see the Sadguru as a solid mass of Brahman-consciousness. As a result of this realization, divinity then begins to arise in their perception of all beings, culminating in the state of undifferentiated worship, where the distinction between the self, the Guru, and others dissolves.