Can you elaborate on the relationship between meditating on Sai's physical form (Saguna) and realizing the formless Self (Nirguna) as described in Chapter 52?

Chapter 52 explains a key spiritual process involving the worship of form to reach the formless. It states that by meditating immensely on Sai's physical form, or Saguna, the devotee can realize the subtle nature of the Self as the physical form 'vanishes' from the mind's eye. The chapter posits that this is a necessary step, asserting that 'without entering the Saguna form, the light of the Self cannot be known.' This is because the formless, attributeless Parabrahma is 'entirely difficult to understand' directly. Thus, meditating on the physical form is presented as the pathway to grasping the formless ultimate reality.