According to Chapter 28, what distinguishes a Sadguru from others, including a biological father?

Chapter 28 explains that a Sadguru, like Sai Baba, possesses unique and divine qualities. The text describes Sai as being "complete in Shabda-Brahma" and proficient in showing the signs of Para-Brahman, or the Supreme Being. A true Sadguru is defined as one who is not only established in their own true nature but can also effectively impart teachings to disciples. The chapter draws a powerful contrast between a father and a Guru. While a father gives birth to the physical body, which is bound to the cycle of birth and death, the Guru's compassion is considered greater because, as stated in Chapter 28, the Guru "removes both birth and death."