Based on the teachings in Chapter 19, what is the relationship between faith and patience, and why are they considered so important?

Chapter 19 describes Faith (Nishtha) and Patience (Saburi) as being intrinsically linked, referring to them as "like two sisters, dear as life to each other." Their importance is paramount, as they are the "two paise" Baba's own Guru requested, signifying the core requirements for a disciple. The chapter further states that a Guru, even a powerful one, expects strong faith at his feet and the courageous strength of patience from the disciple. A person without patience, regardless of their knowledge or virtue, is in a pitiable state, and their life is considered in vain.