Can you explain the analogies used in Chapter 17 to describe the choice between the path of the pleasant and the path of the good?

Chapter 17 employs several vivid analogies to illustrate the choice between Shreya and Preya. It compares a wise person choosing the spiritual path to a swan (Maral) that drinks only the pure milk when it is mixed with water, leaving the water behind. Similarly, a wise and courageous person clings only to Shreya and turns away from Preya. The text also describes beginningless ignorance, or Maya, as being as false as seeing silver in a shell or a mirage in the desert, which are obstacles on the path. This chapter uses these images to clarify the difficult choice one must make in life.