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

Chapter 17 of the Sai Satcharitra employs a powerful analogy to describe the choice between Shreya (the good) and Preya (the pleasant). It explains that these two paths are often mixed together, just as milk can be mixed with water. The text then introduces the swan (Maral), which is said to have the unique ability to separate the mixture and drink only the pure milk. In the same way, the chapter teaches that courageous, intelligent, and wise individuals are like the swan; they are able to discern and cling only to Shreya, consistently turning away from the allure of Preya, thus making the right choice for their spiritual well-being.