How does Chapter 52 explain the progression from meditating on the manifest form (Saguna) to realizing the formless Self (Nirguna)?

Chapter 52 outlines a clear spiritual progression, stating that meditating immensely on Sai's physical form (Saguna) is the necessary first step. It teaches that as the devotee's focus on the Saguna form deepens and eventually vanishes, the subtle nature of the Self will manifest. The chapter reasons that the light of the Self cannot be known without first engaging with the Saguna form, because the Parabrahma, which is without attributes (Nirguna), is otherwise entirely difficult to comprehend directly. Thus, the form leads to the formless.