Can you explain the analogy of the gem and the stone from Chapter 19? Why do they have different results from the same process?

The analogy of the gem and the stone, found in Chapter 19, illustrates the difference in a disciple's receptivity and inherent nature. Both a stone and a gem are rubbed on the same whetstone, representing the uniform spiritual guidance and process provided by a Guru. However, the outcomes are vastly different. The text explains, "a gem becomes a sparkling diamond, while a stone remains smooth by its own nature." This metaphor suggests that while the Guru's teachings are available to all, a disciple's ability to transform and achieve brilliance depends on their inner qualities—their capacity for faith, patience, and devotion. One cannot gain the luster of a gem without possessing that gem-like potential within.