According to Chapter 11, why is it important to worship a Guru in a physical, manifest form?

Chapter 11 of the Shri Sai Satcharitra explains the significance of devotion to a Saguna, or manifest, Guru. The text posits that as long as a devotee has a physical body, the Guru must also be in a physical form for worship to be effective. This is because devotion to the manifest (Saguna) form is necessary for the "bud of the mind" to open and bloom. The chapter argues that understanding the Saguna is much easier than grasping the abstract Nirguna (unmanifest), and once love for the physical form of the Guru is firm, the realization of the formless will naturally follow. It provides a practical perspective, noting that a physical form is necessary for exchanging words of love and performing acts of worship.