I've heard devotees used to bring books to Baba. What was the purpose of this practice?

Chapter 27 describes a common practice where devotees would bring books to Sai Baba to receive his blessing. When a desire to read a particular sacred text arose in their minds, they would purchase the book and give it into Baba's hands. He would then return it to them as a form of 'prasad' or blessing. The belief, as mentioned in the text, was that reading a book blessed in this manner would lead to the acquisition of great merit and was a source of supreme welfare. For instance, Dasganu offered books like Santaleelamrut, and Baba once gave the book Viveksindhu to Shama in this way.