Why is meditating on Sai's physical (Saguna) form considered important in Chapter 52, and what does it lead to?

In Chapter 52, meditating on Sai's physical, or Saguna, form is presented as a vital initial step on the spiritual path. The text argues that the ultimate reality, the Parabrahma which is without attributes, is entirely difficult to understand directly. Therefore, one must first enter the Saguna form. The chapter states that without doing so, the light of the Self cannot be known. The process described is that by meditating immensely on Sai's physical form, the devotee's focus on the external form eventually vanishes, allowing the subtle nature of the inner Self to manifest.