What is the significance of having a pure heart on the spiritual path, and what is the prescribed method for achieving it?

According to the teachings in Chapter 17, a pure heart is an absolute prerequisite for attaining true knowledge. Without it, knowledge cannot be gained. The text explains that the way to create this purity of heart is by performing one's prescribed duties, referred to as Vihitakarma. These actions serve to cleanse the impurities of the heart. Once the heart has become pure, the qualities of discrimination and detachment are naturally born within it, which are essential for progressing towards liberation while living.