What does the author mean by 'undifferentiated worship' (Abheda-bhajan) and how is it achieved?

According to Chapter 45, 'undifferentiated worship' (Abheda-bhajan) is a state where divinity arises in all beings, and the devotee sees the divine everywhere. This advanced state is achieved through a specific spiritual practice. The seeker must first recognize that Brahman is eternal while the world is transient. The key is to see the Sadguru as the solid mass of Brahman-consciousness itself. By renouncing the transient world, which gives rise to dispassion (Vairagya), and meditating only on the Guru, this feeling of constancy becomes the means to achieve this elevated state of worship.