What is the significance of meditating on Sai's 'Saguna' or physical form, as explained in Chapter 52?

Chapter 52 highlights the critical role of the 'Saguna' (the form) in spiritual practice. It posits that without first entering the Saguna form, the light of the true Self cannot be known, because the formless Parabrahma, which is without attributes, is entirely difficult to understand directly. Therefore, the chapter advises meditating immensely on Sai's physical form. This practice serves as a gateway, and as the devotee progresses, the Saguna form vanishes, allowing the subtle, true nature of the Self to manifest. This shows the form is a necessary step to understanding the formless.