What distinction is made between a Guru writing their own works versus a devotee writing the Guru's biography?

A clear distinction is drawn between the types of service a Sadguru accepts through books. According to chapter 0, one form is when the Guru themselves creates profound spiritual works, such as Shri Dnyaneshwari or Shri Dasbodh. The other form is when the Guru has their biography written by a devotee. The text explicitly categorizes the biography written by Shri Samarth Sadguru Vasudevanand Saraswati Maharaj differently from those written by devotees like Shri Saraswati Gangadhar and Shri Annasaheb Dabholkar, precisely because the Maharaj himself was the author. This highlights the unique roles of the Guru as a direct bestower of wisdom and the devotee as a chronicler of that Guru's life and grace.