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

Chapter 52 explains that realizing the formless Absolute, or Parabrahma, is an entirely difficult task for most people. Therefore, it posits that the path to the formless begins with the form. The chapter teaches that one must first enter the Saguna, or the Guru's physical form, because without it, the light of the true Self cannot be known. By meditating immensely on Sai's physical form, the subtle nature of the Self will eventually manifest. As this happens, the attachment to the Saguna (form) vanishes, mysteriously leading the devotee toward the supreme goal of understanding the formless reality.