Analyze the reasons for Dev's 'delusion' as described in the incident of the Udyapan ceremony. Why did he fail to recognize Sai Baba in the guise of the Sanyasi?

Dev's failure to recognize Sai Baba was a complex 'delusion' with several contributing factors, as revealed in Chapter 40. Firstly, Dev's own mind created a barrier; he had a preconceived notion of how Baba might appear, and the humble Sanyasi did not fit this expectation. Secondly, Baba himself spread a 'veil of Maya,' a divine illusion, as part of the test. Most importantly, Dev himself reflects on a critical detail after learning the truth: this same Sanyasi had visited him previously to collect funds for cow protection. This prior, mundane interaction fixed the Sanyasi's identity in Dev's mind as just a fundraiser, making it impossible for him to later perceive that same person as the divine Sai Baba. Dev lamented this, realizing his vision was confused because the Sanyasi's first appearance was for 'his own work.'