How are Faith (Nishtha) and Patience (Saburi) related, and what role do they play in the Guru-disciple relationship?

Faith (Nishtha) and Patience (Saburi) are presented as deeply interconnected and indispensable qualities in the Guru-disciple relationship. Chapter 19 describes them as being 'like two sisters, dear as life to each other.' They are the primary offerings a disciple makes. Even a powerful Guru expects these specific qualities from a disciple: 'strong faith at the Guru’s feet and the strength of courage which is patience.' The text uses the analogy of a gem and a stone being polished; both undergo the same process, but only the gem, representing a disciple with faith and patience, becomes a brilliant jewel. A disciple without these qualities, like the stone, remains fundamentally unchanged despite the Guru's efforts. Therefore, these two virtues are the very foundation upon which the Guru builds the disciple's spiritual growth.