If the goal is salvation, wouldn't it be better to learn from as many saints as possible? Why does the preface advocate for focusing on just one Sadguru?

The preface in Chapter 0 addresses this very point by establishing a hierarchy of 'Guru service.' While it acknowledges that writing biographies of many saints is a spiritual act, it also claims this approach is 'one-sided or partial' and makes it difficult to reach the ultimate goal. According to the author's 'humble understanding,' the most effective path is singular and focused. Chapter 0 states the 'best and most certain service in writing that grants the fruit of salvation is to write the biography of one's Sadguru' and personally study it with 'unwavering devotion.' This suggests that deep, concentrated devotion to one Sadguru is considered more spiritually fruitful than a broader, less focused study of many.