What was the author Annasaheb's initial perspective on Guru devotion, and what caused it to change?

Based on the account Annasaheb wrote about himself in the third chapter, his initial stance was one of complete disbelief in Guru devotion. The preface in chapter 0 elaborates on this, stating that he used to think making a Guru was a fraud and took great pride in his own doership, arguing there was no need for one. His perspective underwent a radical transformation as soon as his eyes met Baba's. This powerful encounter, described as an 'internal spiritual witness,' completely shattered his pride and left him fully convinced that a Sadguru is essential to cross the ocean of life.