What is the significance of 'Purushartha' as described in Chapter 17, and how is it related to the suffering of worldly existence?

According to Chapter 17, 'Purushartha,' or true human effort, is defined as the act of discarding Preya (the pleasant) to honor Shreya (the good). This concept arises when a person, exhausted by the suffering and three unendurable torments (Tritapa) of worldly existence (Samsara), begins to question how to stop this painful cycle. The text states that when this thought arises by great fortune, true manhood is born, and the individual chooses the means for their own true self-interest. Therefore, Purushartha is the conscious struggle for salvation, strengthening the intellect to overcome obstacles on the spiritual path.