What is the philosophical distinction made in Chapter 42 between the birth anniversary of a god and the death anniversary of a saint?

In describing the day of Sai Baba's passing, Chapter 42 makes an insightful philosophical point. It notes that while the day happened to be Buddha Jayanti for some, for Sai's followers, it became his Punya Tithi, or death anniversary. The text elaborates on this by stating, "The birth anniversary of gods is the death anniversary of saints." This distinction suggests that while divine beings are celebrated for their incarnation, great saints are venerated on the day they leave their physical form, as this marks their ultimate liberation and merger with the absolute, a moment of profound spiritual significance and teaching for their devotees.