How does Chapter 17 connect the concept of 'Purushartha' (true human effort) to overcoming worldly suffering and choosing the right path?

In Chapter 17, 'Purushartha,' or true human effort, is presented as the active choice to discard Preya and embrace Shreya. This effort is born when an individual, exhausted by the 'three unendurable torments' of worldly existence (Samsara), begins to seek a way to stop this cycle of suffering. The text explains that this quest for a solution marks the birth of true manhood or Purushartha. This effort involves strengthening one's intellect to resist obstacles on the path of Shreya and to make the difficult but correct choice, much like the swan that takes only the milk when it is mixed with water.