According to Chapter 11, why is it important to have a Guru with a physical form, and how does this relate to the concepts of Saguna and Nirguna?

Chapter 11 of the Shri Sai Satcharitra explains that for a devotee who has a physical body, a Guru in a physical, manifest (Saguna) form is essential. This is because devotion cannot truly manifest without meditating on a tangible form, which is necessary for worship with offerings and for exchanging words of love. The chapter clarifies that understanding the Saguna is much easier than grasping the formless (Nirguna). Once a devotee's love for the Saguna form is firmly established, the realization of the Nirguna naturally follows. As the text states, the manifest and unmanifest are not different, just as frozen and melted ghee are both still ghee.