What does Chapter 17 identify as the primary purpose of human life and the initial trigger for pursuing it?

Chapter 17 teaches that the true purpose of human life, or Purushartha, is to actively discard the pleasant path of Preya and honor the good path of Shreya. The text suggests that the journey toward this purpose is often triggered by suffering. When a person becomes exhausted by the three unendurable torments of worldly existence (Samsara), they begin to search for a way to stop this cycle. As Chapter 17 explains, when this thought arises by great fortune, true manhood is born, and the individual starts choosing the means for their own true self-interest.