What specific 'ear-mantra' did Sai Baba's Guru finally impart after Baba served him for twelve years and gave him the two paise?

According to the provided text from Chapter 19, Sai Baba did not actually receive a specific 'ear-mantra' from his Guru. The chapter clarifies this common misconception, stating, "I wore myself out serving him, yet he wouldn't give me a 'ear-mantra' (secret instruction)." The request for two paise was symbolic. As explained in the chapter, "Faith (Nishtha) and Patience (Saburi)—these were the two paise, nothing else." By giving these two virtues, Baba pleased his Guru. The core teaching was not about a secret syllable but about the cultivation of faith and patience as the foundation of a disciple's path, which is more valuable than any mantra.