Why is Sai Baba's nature described in the Satcharitra as being 'incomprehensible' and 'unfathomable'?

Chapter 37 describes Sai Baba's actions as "incomprehensible and marvelous" because His state was unpredictable and transcended ordinary understanding. He was sometimes seen intoxicated with the bliss of the Self (Brahmananda), and at other times, He appeared to perform actions while remaining completely detached. The text notes that those who try to understand the cause behind His actions eventually become exhausted and can only sit in amazement. This unfathomable nature, sometimes pleasant like the ocean yet deep and profound, is why the chapter asks, "Who can truly and accurately describe His unfathomable form?" His life was a constant demonstration of being in the world but not of it.