What specific prayer is mentioned at the beginning of Amir's story, and how does it relate to his trial?

Before recounting Amir's story, Chapter 22 shares a powerful prayer from a woman who suffered infinite calamities. She prayed to God, saying, "Give me a constant series of sorrows, so I do not forget Your name." This sets a profound theme for the subsequent narrative. Amir's trial in the dilapidated Chavadi, with all its external miseries, can be seen as such a calamity. However, it was this very trial, ordained by Baba, that kept him constantly at the Guru's feet, ensuring he had frequent darshan and remembrance. The hardship became the means to remain connected to Sai, echoing the sentiment of the prayer.