Can you explain the initial skepticism towards Guru devotion held by the author, Annasaheb, and how it was overcome?

Based on the account in Chapter 0, Annasaheb initially harbored a strong disbelief in the concept of Guru devotion. He went so far as to think that the practice of 'making a Guru was a fraud' and argued that one was not necessary, taking significant pride in his own doership and self-sufficiency. This deep-seated skepticism was completely dismantled upon meeting Baba. The preface describes a moment when their eyes met, triggering an 'internal spiritual witness' that shattered his pride. This powerful experience led him to the conviction that a Sadguru is indispensable for navigating life's challenges, a transformation that was a direct result of Baba's grace.