The text uses an analogy of a stone and a gem being polished. How does this relate to a disciple's relationship with their Guru and the importance of faith and patience?

Chapter 19 employs a powerful analogy of a stone and a gem to illustrate the dynamic between a Guru and a disciple. Both are subjected to the same polishing process, but the outcomes differ: the gem becomes a brilliant jewel, while the stone merely becomes smooth. As explained in the chapter, this represents the Guru's teaching. The Guru's wisdom (the polishing) is offered to all, but the disciple's innate readiness and spiritual constitution—specifically their capacity for 'strong faith at the Guru’s feet and the strength of courage which is patience'—determine the result. A disciple with the inherent quality of a 'gem' will brilliantly reflect the Guru's teachings.