How can followers of a Sadguru provide service through literary works?

According to the preface in Chapter 0, a Sadguru accepts two primary forms of service from devotees through books. The first is when the Guru themselves creates a monumental work, such as the Shri Dnyaneshwari. The second, more common method, is when the Guru inspires devotees to write their biographies. By writing, studying, and performing Parayans (devotional readings) of these biographies, both the author and the wider congregation of devotees are able to perform service. This act of collective study helps everyone involved achieve the purpose of their lives.