Even after personally serving three uninvited guests, why did Dev remain doubtful, and what action did he take to resolve his confusion?

Despite the direct experience of serving the Sanyasi and his two companions, Dev's mind was clouded by a "veil of Maya," preventing him from recognizing the event's potential spiritual significance. Chapter 40 explains that he simply saw them as guests who came for a meal, and the possibility that this was Sai Baba's promised visit did not fully penetrate his consciousness. This lingering doubt was so profound that after the Udyapan ceremony was finished, he sought external confirmation. He wrote a letter to Jog, lamenting how Baba had seemingly "deceived" him and expressing his disappointment that he did not receive the profound experience he had awaited, showing his deep confusion over the entire affair.