Please locate the quote from Gajanan Maharaj in Chapter 14 where he states, "I lack only the one who loves Me as his very life."

The quote "I lack only the one who loves Me as his very life; if he gives Me one quality, I give him a hundred qualities in return" is present in the provided text from Chapter 14. However, it is incorrectly attributed to Gajanan Maharaj in your question. The text explicitly states this was spoken by Sai Baba. This statement is part of a larger description of Baba's unique ways and his practice of asking for Dakshina. The narrative context involves Ratanji's visit to Sai Baba in Shirdi, and there are no references to Gajanan Maharaj at all.