How can devotees still feel Sai Baba's presence even though he is no longer in his physical body?

Chapter 43 explains that when Sai Baba left his physical form, he merged into the unmanifest but also 'stayed in the hearts of the devotees.' His consciousness was so powerful that it became 'firmly imprinted' in their hearts. The text assures that even after leaving Shirdi in his physical form, he became one with Brahman and, in his true form, now 'fills the moving and non-moving world.' Devotees can still experience his presence because he continues to keep them 'awake' from his unmanifest state, and the text notes that 'whatever the feeling in one's mind, such is the experience even today.' His influence is considered proven and ever-present.