Why does Chapter 11 advocate for worshiping a Guru with a physical form?

According to Chapter 11, worshiping a Guru in a physical, or Saguna, form is essential for a devotee who also possesses a physical body. The text argues that devotion never truly manifests without meditating on the Saguna form. This devotion is necessary for the 'bud of the mind' to open. As Chapter 11 clarifies, understanding the Saguna is much easier than grasping the formless Nirguna. Once a devotee's love for the Saguna form is firm, the realization of the Nirguna will naturally follow, making it a necessary step on the spiritual path.