Can you detail the contrast in Balasaheb Deo's ability to read the Dnyaneshwari versus other books?

The source material in Chapter 41 makes a clear distinction in Balasaheb Deo's reading habits. He was perfectly capable of reading other books regularly and without issue; this was true even when he took a three-month leave to rest at his home in Ponda. The problem was uniquely tied to the Dnyaneshwari. Despite his strong desire and repeated resolutions to read it daily, some internal obstacle always arose. When he took the Dnyaneshwari in hand, 'some doubts would arise in the heart,' which caused the reading to remain 'superficial.' He could not cultivate the 'love within' for the text, a problem he did not seem to have with other regular books. This specific and persistent block is what led to his profound frustration and his ultimate surrender to Sai Baba's will.