Why does Chapter 11 emphasize devotion to a manifest (Saguna) Guru, and what is the relationship between the manifest and unmanifest forms?

Chapter 11 of the Sai Satcharitra explains that for a devotee who has a physical form or body, the Guru must also be in a physical, manifest (Saguna) form for devotion to properly develop. The text states that loving devotion does not occur without meditating on the Saguna form, which is necessary for the 'bud of the mind' to open. The chapter clarifies that the manifest ('Sakara') and unmanifest ('Nirakara') are not different; they are one and the same. It uses the analogy of ghee, which is called ghee whether it is frozen (like the Saguna form) or melted (like the Nirguna form), to illustrate that both forms are ultimately one.