Why did Dev fail to recognize Sai Baba when he appeared as a Sanyasi, and how did he feel after learning the truth?

Dev failed to recognize Sai Baba due to what Chapter 40 calls a "veil of Maya" and a series of misleading circumstances. Dev later rationalized his mistake, explaining that the Sanyasi had first appeared for fundraising for cow protection before Dev had even invited Baba to the Udyapan. Because of this prior context, when the same person returned for a meal, Dev did not infer it was Baba. He also admitted he forgot Baba's specific words: "When I come for the meal, two others will come with me." After learning the truth from Jog's letter, Dev was overwhelmed with emotion. He felt immense shame for doubting Sai, exclaiming, "Shame, shame! I blamed Sai in vain!" and felt very dejected, recognizing his own pride had blinded him.