How does Chapter 52 describe the philosophical journey from worshipping the form (Saguna) to realizing the formless (Nirguna)?

Chapter 52 delves into the advanced spiritual concept of transitioning from the Saguna to the Nirguna. It explains that meditating on Sai's physical form (Saguna) is an essential preliminary step, as the formless Self, or Parabrahma, is otherwise entirely difficult to understand. The text states, "Without entering the Saguna form, the light of the Self cannot be known." Through immense meditation on Sai's physical form, the subtle nature of the Self begins to manifest as the attachment to the form (Saguna) vanishes. In this way, Sai mysteriously leads His devotees toward the supreme goal, where duality dissolves, similar to how a river forgets its river-ness upon embracing the ocean.