Can you provide a summary of the key philosophical concepts discussed in Chapter 17 of the Sai Satcharitra?

Chapter 17 of the Sai Satcharitra delves into the profound distinction between two life paths: Shreya, the path of ultimate good and salvation, and Preya, the path of worldly pleasure. The text explains that these two are as opposite as light and darkness. As mentioned in the chapter, Shreya is equated with pure Knowledge (Vidya) and wisdom, while Preya is rooted in ignorance (Avidya) and attachment to transient worldly objects. The chapter urges individuals to pursue Shreya, which is the true purpose of human life, even though it may be difficult. The text uses the analogy of a swan separating milk from water to illustrate how a wise person should choose the good (Shreya) over the pleasant (Preya).