Why does Chapter 11 of the Sai Satcharitra emphasize the importance of worshipping a Guru with a physical form?

Chapter 11 explains that devotion to a manifest, or Saguna, Guru is crucial for a devotee who also possesses a physical body. The text argues that true devotion cannot manifest without meditating on a tangible, physical form. As stated in Chapter 11, the scriptures determine that for a devotee with a form, a Guru with a form is most suitable. This is because, as the chapter illustrates with a metaphor, loving devotion is necessary for the "bud of the mind" to open and bloom, and this devotion is cultivated through the worship of a manifest Guru like Sai Baba.