Why did Balasaheb Deo find reading the Dnyaneshwari so difficult, and what final vow did he make regarding this practice?

Balasaheb Deo's difficulty with the Dnyaneshwari stemmed from several issues, as mentioned in Chapter 41. While he could read other books regularly, whenever he took the Dnyaneshwari in hand, some unspecified obstacle would arise, or doubts would surface in his heart. This caused his reading to remain superficial, and he couldn't develop a deep love for it, leaving him distressed. After failing to maintain even a minimal resolution of reading five verses daily, he made a final, decisive vow. He resolved with firm faith at Sai's feet that he would only start reading the Dnyaneshwari when Sai Baba Himself gave a direct order to "Read."