What analogies does Chapter 17 use to illustrate the choice between Shreya and Preya?

In Chapter 17, several analogies are used to clarify the choice between Shreya (the Good) and Preya (the Pleasant). The primary analogy is that of a swan (Maral) which can drink only the pure milk from a mixture of milk and water. Similarly, wise and intelligent individuals are like the swan, clinging only to Shreya and discarding Preya. The text also compares the two paths to light and darkness, which are of opposite natures. Furthermore, it likens the false allure of worldly desires to gathering pebbles of gold in a dream, which seem useful but vanish upon waking, highlighting the ephemeral nature of Preya.