What is the catalyst that prompts a person to begin seeking the path of salvation, according to the teachings in Chapter 17?

As per the teachings in Chapter 17, the search for salvation often begins after one has suffered greatly. When a person becomes exhausted by enduring the three unendurable torments of worldly existence (Samsara), they reach an extreme peak of sorrow. This suffering prompts them to investigate how to stop the incessant wheel of existence. The text states that when this thought arises, it is by great fortune, and true human effort (Purushartha) is born. At this turning point, the individual begins to actively choose the means for their own true self-interest and salvation.