Based on Chapter 21, what is the prerequisite for being able to have the 'darshan' or vision of a saint?

Chapter 21 of the Sai Satcharitra emphasizes that the ability to meet or have the vision of a saint is not a casual occurrence but depends entirely on divine will and one's own destiny. The text states that "Unless good fortune dawns, One does not encounter Saints and Sages." It further clarifies that this company of saints is not accessible to the unfortunate and is only easy to attain when "God’s grace is present." The author illustrates this with his own past failure to visit Pir Maulana, concluding that one can be physically close to a saint, even having them "near one's pillow," but a sinful or unlucky person will still be unable to see them.