Can you explain the relationship between meditating on Sai's physical form and understanding the formless Self, as detailed in Chapter 52?

Chapter 52 presents a profound teaching on meditation, explaining that the formless, attributeless Parabrahma (Nirguna) is entirely difficult for a person to grasp directly. Therefore, it advises meditating on Sai's physical, or Saguna, form. The text states that by meditating immensely on Sai's physical manifestation, the subtle nature of the true Self will eventually be revealed as the focus on the Saguna form vanishes. This implies that the physical form acts as a crucial gateway; without entering the Saguna, the light of the formless Self cannot be known, making it a necessary step toward realizing the supreme goal.