How does Chapter 19 describe the relationship between Faith and Patience, and why are they so important for a disciple?

In Chapter 19, Faith (Nishtha) and Patience (Saburi) are described as being deeply interconnected, like 'two sisters, dear as life to each other.' This highlights their inseparable nature in the path of a disciple. The text emphasizes that a Guru, even a powerful one, primarily expects 'strong faith at the Guru’s feet and the strength of courage which is patience' from their disciple. The passage suggests that patience is a 'mine of virtues' and the 'manliness of men,' capable of warding off sin, distress, and calamities. Without these twin virtues, a person's life is considered in vain, regardless of their scholarship or other good qualities.