How does Chapter 52 explain the importance of meditating on Sai's physical form (Saguna) to understand the ultimate formless reality (Nirguna)?

In Chapter 52, a clear philosophical point is made about the progression from worship of the form (Saguna) to understanding the formless (Nirguna). The text states that by "meditating immensely on Sai's physical form," the devotee can experience a point where the form itself vanishes, allowing the "subtle nature of the Self" to manifest. It explicitly teaches that "Without entering the Saguna form, the light of the Self cannot be known." This is because the ultimate reality without attributes, Parabrahma, is described as "entirely difficult to understand" directly, making Sai's form a crucial and accessible gateway for devotees to approach the formless divine.