Why was Balasaheb Deo having such a hard time reading the Dnyaneshwari, even though he could read other books?

According to Chapter 41, Balasaheb Deo faced unique difficulties with the Dnyaneshwari that he didn't experience with other books. While he could read other texts regularly, whenever he took the Dnyaneshwari in hand, some doubts would arise in his heart. This caused his reading to remain superficial, and he couldn't develop a deep love for the text. This internal resistance was a significant obstacle, preventing his resolution to read it from reaching completion, even when he took three months' leave specifically for rest and spiritual practice.