Using Sai Baba's analogy of the stone and the gem, how do faith and patience affect a disciple's spiritual development?

As detailed in Chapter 19, Sai Baba uses a powerful analogy to explain the role of inner qualities in spiritual growth. He compares two disciples to a stone and a gem being polished on the same whetstone, which represents the Guru's guidance. While the process is the same for both, the gem becomes a brilliant jewel, whereas the stone only becomes smooth. A disciple who cultivates strong Faith (Nishtha) and Patience (Saburi) is like the gem, able to absorb the Guru's teachings and transform into something brilliant. A disciple lacking these virtues is like the stone, which cannot gain the gem's luster. This shows that the disciple's inner readiness is crucial for spiritual transformation.