How does Chapter 17 use the analogy of a swan to illustrate the choice between the paths of wisdom and worldly pleasure?

In Chapter 17, an elegant analogy is used to illustrate the challenge of choosing between Shreya (wisdom) and Preya (worldly pleasure). The text states that these two paths are often mixed together, just as milk can be mixed with water. However, a 'Maral' or swan possesses the unique ability to separate the two and drink only the pure milk. As explained in Chapter 17, this symbolizes how courageous, intelligent, and wise individuals can discern and cling exclusively to Shreya, the path of true self-interest, while turning away from the allure of Preya. This analogy highlights the importance of discrimination in navigating life's choices to achieve the ultimate purpose of human life.