The text discusses different types of Guru service. Can you compare and contrast the worldly and spiritual forms of this service?

The preface in Chapter 0 outlines a clear distinction between worldly and spiritual Guru service. Worldly service involves honoring great figures like politicians, warriors, or writers by creating their biographies. While this is a form of public service, its fruit is not eternal and is limited by space and time. It is often rooted in self-interest and therefore does not yield spiritual benefits. In contrast, spiritual service, such as writing the biographies of saints, does yield spiritual fruits. The highest form of this service is writing the biography of one's own Sadguru, which is described as the most certain path to the ultimate spiritual goal of salvation, unlike the limited nature of worldly service.