How does the act of writing biographies function as a form of Guru service?

Based on the information in Chapter 0, writing biographies is presented as a significant form of Guru service with varying levels of spiritual impact. Writing about worldly figures like brave warriors or teachers is a form of public and Guru service, but its fruits are worldly and temporary. A more spiritually beneficial act is writing the biographies of many saints. However, the most profound and certain service for achieving salvation is to write the biography of one's own Sadguru. This act is not merely literary; it is a devotional practice of the body and speech that, when combined with regular study and recitation, leads to the ultimate spiritual goal.