Whatever purpose Win had, He activated those books for 30 minutes and became thoroughly proficient. What I notice here-

1. He did not dip into the entire book in 30 minutes.(for sure)
2. He could become proficient in the entire therapeutic system even without having dipped in most of the parts of the book.

How does this feat can only be related to 'purpose' alone?

There is no denying the photoreading system stands on the pillar of purpose. But there are a few things that are very confusing-
1. how to find a purpose that brings me in depth knowledge and proficiency
2. how does change in purpose changes the result.
I mean, I remember that example in the book, setting a purpose for reading in dentist's office for distraction. Okay. I set that purpose, but then how will superreading and dipping help me distract my mind from the destist preparing for root canal? and where do I go to superread and where do I dip in such scenario?

thanks..