Where in the preface does it discuss the poet-saint Kabir and his philosophy on Guru service?

The preface (Chapter 0) does not contain any mention of the poet-saint Kabir or his specific philosophy. Instead, it outlines its own perspective on Guru service. It distinguishes between worldly service, such as writing biographies of great politicians or jurists, and spiritual service. According to the author, the highest and most certain form of service is to write the biography of one's own Sadguru, ideally in a detailed poetic form, and then to regularly study it and encourage others to do the same. This, the text claims, is a path to salvation that does not interfere with worldly duties.