How does the author resolve the apparent contradiction between a Sadguru being a book and the Dnyaneshwari's instruction to physically 'surrender at their feet'?

The preface does not explicitly resolve this potential contradiction. In Chapter 0, the author first presents the broad idea that a Sadguru can be a person, a book, or various other things. It then quotes from the Dnyaneshwari, which emphasizes active, physical service to saints, such as surrendering at their feet without ego. The text presents both concepts but does not delve into a philosophical discussion on how to reconcile them. The author's primary goal in this section seems to be establishing the critical importance of a Guru in any form and then transitioning to highlight the supreme value of writing and studying a Sadguru's poetic biography.