Chapter 17 uses the analogy of a swan separating milk from water. How does this relate to the choice between Shreya and Preya?

In Chapter 17, the analogy of the swan, or Maral, drinking only the pure milk from a mixture of milk and water serves as a powerful metaphor for spiritual discrimination. The text explains that Shreya (the good) and Preya (the pleasant) are often blended together in life, making the right choice difficult. Just as the swan possesses the unique ability to separate and consume only the milk, the wise, courageous, and intelligent person is able to discern and cling only to Shreya. This imagery, as presented in Chapter 17, highlights that while a dull-witted person embraces the whole mixture and is conquered by Preya, the true spiritual aspirant must cultivate this swan-like ability to distinguish and choose salvation over worldly enjoyment.