What does Sai Baba teach about the importance of patience, or Saburi?

According to Chapter 19, Sai Baba holds patience, or Saburi, as a supreme virtue essential for any person. He describes it as courage and the 'manliness of men,' which helps one navigate life's greatest burdens. He teaches that patience is a 'mine of virtues' that wards off sin, distress, and poverty while averting calamities and fear. Baba illustrates its significance by personifying Faith (Nishtha) and Patience (Saburi) as 'two sisters, dear as life to each other.' He emphasizes that a life lived without patience is 'in vain,' regardless of one's knowledge or other virtues, showing it to be a foundational requirement for a meaningful existence.