How did Dev's internal state of mind and his feelings of blame evolve throughout the Udyapan incident?

Dev's state of mind underwent a dramatic transformation. Initially, he was filled with joyful anticipation for Baba's visit. When Baba didn't appear as expected, this joy turned to doubt and disappointment, leading him to feel deceived. As revealed in Chapter 40, he wrote a letter to Jog filled with a sense of grievance, directly stating that Baba's words had "turned out otherwise." However, after receiving Jog's letter with Baba's explanation, his mindset completely reversed. The blame he had placed on Baba turned inward, and he was overwhelmed with shame and regret. He lamented, "Shame, shame! I blamed Sai in vain!" and recognized his own "pride of knowledge" as the cause of his failure to perceive the truth, ultimately reaffirming his love and reverence for Baba.