Can writing biographies of historical figures be considered a valid form of Guru service, and what are its limitations from a spiritual perspective?

Yes, writing biographies of great historical figures such as politicians, jurists, or writers can be considered a form of worldly Guru service and public service. However, the preface to the Shri Sai Satcharita points out its significant spiritual limitations. As mentioned in Chapter 0, this type of service is worldly in nature, its importance is not eternal, and it is limited by space and time. Even if it contains elements of public education, it is often rooted in self-interest and therefore does not yield the spiritual fruits necessary for attaining the ultimate goal of salvation.