Why does the text say that ultimately only one's own self is the companion for achieving spiritual goals, and not family?

Chapter 45 argues that worldly relations cannot be fully relied upon for achieving one's ultimate spiritual goal. It states that people who do not help in worldly life are unlikely to help in spiritual matters. The text provides examples of the limitations of familial love: a mother and father show affection, a son eyes the wealth he can claim, and a wife mourns her potential widowhood. These connections are rooted in worldly concerns. Therefore, it concludes that "no one is a companion in the spiritual goal." Upon final reflection, the text asserts that "only one’s own self remains at the end," urging the seeker to give up hope in others, cultivate strong self-confidence, and take personal responsibility for their liberation.