What principle does the author try to prove with his own experience in Chapter 21, and how does it relate to meeting Sai Baba?

In Chapter 21, the author aims to prove the principle that "Unless good fortune dawns, One does not encounter Saints and Sages." He uses his personal story of failing to visit the Siddha Pir Maulana in Bandra, despite being nearby and encouraged to go, as a prime example of this truth. He attributes his failure to "ill-luck" that stood in his way. He contrasts this past failure with his present situation, stating, "Later, when that time came, Shirdi became an unbreakable bond." The point he makes, as explained in Chapter 21, is that the company of Saints is not a casual matter but is accessible only when God's grace is present. This difficult union becomes easy only when one's destiny allows for it, explaining why he eventually found his way to Sai Baba.