Why is it so important for a devotee to have a Guru in a physical form, according to Chapter 11?

According to the teachings in Chapter 11, a physical or 'Saguna' Guru is essential for a devotee who themselves possesses a physical body. The text argues that devotion can never truly manifest without meditating on this manifest form. It uses the metaphor of a flower, stating that until loving devotion occurs through this process, the "bud of the mind does not open." As Chapter 11 explains, if the mind doesn't bloom, it lacks fragrance and nectar, meaning it cannot attain a higher spiritual state. The chapter posits that this is the determined path of the scriptures: a physical form for the worshipper requires a physical form for the Guru.