Why does Chapter 11 argue that a Guru in a physical, manifest form is important for a devotee's spiritual progress?

Chapter 11 of the Sai Satcharitra strongly argues for the necessity of a physical Guru for a devotee's spiritual journey. It states that as long as the worshipper has a form (a body), the Guru must also be in a physical form. This is because devotion cannot manifest without meditating on a Saguna form. The chapter uses the metaphor that until loving devotion occurs, the 'bud of the mind' does not open. A physical form is also practical for worship; it provides a tangible presence where one can place their head at the Guru's feet, exchange words of love, and offer sandalwood and grains. The text concludes that understanding the Saguna is easier and serves as the path to realizing the Nirguna.