Why are worldly relationships considered insufficient for achieving spiritual goals?

Chapter 45 explains that worldly relationships are ultimately unreliable for one's spiritual journey because they are often rooted in self-interest. The text suggests that even close family members cannot be fully relied upon for spiritual support. It states that while a mother and father show affection, a son will be focused on the wealth he can claim, and a wife will primarily mourn her own potential widowhood. These relationships are seen as temporary and transactional, unable to serve as a companion in the ultimate spiritual goal. The chapter concludes that upon final reflection, only one's own self remains as the constant through whom the spiritual goal can be achieved.