Is it a flaw that a spiritual text like this omits the stories of countless other saints? What does the book itself say about its own narrow focus?

The preface in Chapter 0 frames this narrow focus not as a flaw, but as a feature essential for achieving its primary purpose: salvation. The author makes a clear distinction, stating that while writing biographies of many saints is a form of spiritual service, it is 'difficult, or rather impossible, to attain the ultimate spiritual goal' that way. In contrast, the text proposes that the 'best and most certain service in writing that grants the fruit of salvation is to write the biography of one's Sadguru' and study it with 'unwavering devotion.' From this perspective, the book's tight focus is the very method that makes it a powerful tool for spiritual attainment, rather than an oversight or a flaw in its composition.