I'm interested in spiritual growth. How does the text distinguish between worldly service and true spiritual service that leads to salvation?

The preface in Chapter 0 makes a clear distinction between different types of service. It describes worldly service, such as writing biographies of worldly figures, as being limited by time and space and often rooted in self-interest, thus not yielding spiritual fruits. In contrast, true spiritual service, which is considered the best and most certain path, involves writing the biography of one's Sadguru. As detailed in Chapter 0, this service should be undertaken with selfless love and unwavering devotion, and it includes regular study and recitation. This form of service is considered a path to attaining the ultimate spiritual goal of salvation.