How does Chapter 28 distinguish the role of a Guru from that of a father, and what defines a Sadguru?

Chapter 28 draws a significant distinction between a father and a Guru. It explains that while a father gives birth to the physical body, which is subject to death, a Guru's role is far more profound. The Guru, through "additional compassion," is said to remove the very cycle of birth and death for the disciple. Furthermore, the chapter notes that a Sadguru is one who is proficient in both Shabda-Brahma and shows signs of Para-Brahman. Even a great scholar who cannot impart teachings can be considered a Sadguru if they are established in their own true nature, as highlighted in this chapter.