Can you elaborate on the dual benefit that arises when an author writes a Guru's biography and other devotees study it?

The source material describes a profound dual benefit stemming from the creation and study of a Guru's biography. As explained in Chapter 0, when a devotee writes a detailed poetic biography, they are performing a form of Guru service. Simultaneously, when other followers study and perform Parayans of this work, the writer receives the added merit of serving God within humanity (Jan-Janardan) and engaging in public service. This process also helps the other devotees achieve the purpose of their own lives, creating a virtuous cycle of service and spiritual fulfillment within the community.