According to the text, what is the ultimate identity of the Guru and how should a disciple meditate upon this reality?

Chapter 45 presents a profound spiritual concept, identifying the Guru as the true Brahman, which is eternal, while the world is described as transient. The prescribed method for a disciple is to renounce the transient world and its attachments and to meditate solely on the Guru. This constant feeling and focus on the Guru is presented as the primary means to achieve the spiritual goal. This practice is said to give birth to dispassion (Vairagya). The text further explains that the Sadguru is a solid mass of Brahman-consciousness, and through this meditation, divinity arises in all beings, leading to what is called "undifferentiated worship" or Abheda-bhajan.