How does the preface differentiate between worldly service and spiritual service?

The preface in Chapter 0 distinguishes between two types of service. Worldly service, such as writing biographies of great politicians or jurists, is considered a form of public and Guru service. However, its importance is limited by time and space, often rooted in self-interest, and ultimately does not yield eternal spiritual fruits. In contrast, as Chapter 0 clarifies, spiritual service, like writing the biographies of saints, is also a form of Guru service but one that yields spiritual benefits. This distinction highlights that while both are forms of service, only the latter is oriented towards spiritual attainment.