Can you explain the philosophical argument Chapter 11 makes for Saguna meditation? How does it connect the manifest form to the formless Brahman?

Chapter 11 presents a sophisticated argument for the necessity of Saguna (manifest) meditation. It posits that for a worshipper who possesses a form (a body), a Guru in a physical form is the most suitable and effective path, a determination it attributes to the scriptures. The chapter explains that loving devotion, which is crucial for spiritual progress or the 'blooming of the mind,' cannot arise without meditating on a manifest form. It then resolves the apparent duality between the manifest (Sakara) and unmanifest (Nirakara), stating they are one and the same, just like frozen ghee and melted ghee are both still ghee. Therefore, as Chapter 11 teaches, by holding onto the Guru's manifest form with total devotion, the devotee experiences the wonder of the Guru himself fluctuating as the Supreme Brahman, thus using the form to realize the formless.