What philosophical principles does Chapter 31 introduce before telling the story of Vijayananda?

Before narrating the main story, Chapter 31 delves into significant philosophical concepts regarding the end of life. It emphasizes that one's state of mind at the moment of death determines their subsequent state, drawing a parallel to how a worm becomes a bumblebee. The text stresses the importance of the 'practice of remembrance of the Name' to ensure that one's final thoughts are fixed on God. According to Chapter 31, this practice, along with satsang (the company of saints), is crucial because even a lifetime of spiritual wakefulness can be rendered vain if one is spiritually asleep at the very end.