Why is meditating on Sai's physical form (Saguna) considered a necessary step for spiritual realization in Chapter 52?

Chapter 52 explains the importance of meditating on Sai's physical form, or Saguna, as a crucial step toward higher spiritual understanding. It states that by meditating immensely on Sai's physical form, the subtle nature of the Self will manifest as the Saguna (form) eventually vanishes. The chapter posits that without first entering the Saguna form, the light of the Self cannot be known. This is because the ultimate reality, the Parabrahma, which is without attributes, is described as being entirely difficult to understand directly. Therefore, the form provides a tangible focus for devotion to lead one toward the formless.