The text mentions the Narada Purana. Can you quote or summarize what the Narada Purana specifically says about the service of writing a Guru's biography?

The provided text in Chapter 0 makes a reference to the Narada Purana to establish the antiquity of writing a Guru's biography. It states, 'The service of writing a Guru's biography is mentioned in the Narada Purana; thus, there is no doubt it is very ancient.' However, the excerpt does not provide any direct quotes, summaries, or further details from the Narada Purana itself. It simply uses the mention as proof of the tradition's age, without elaborating on the content of the reference.