Why is the Guru considered the only reliable companion for achieving spiritual goals, unlike family and worldly relations?

Chapter 45 makes a clear distinction between the support offered by a Guru and that of worldly relationships. It posits that family members, such as a mother, father, son, or wife, cannot be fully relied upon for one's spiritual journey. Their affection and concerns are often tied to worldly matters; for example, a son looks at the wealth he can inherit, and a wife cries for her potential widowhood. In contrast, the Guru is identified as the true Brahman, the eternal reality. By renouncing the transient world and meditating solely on the Guru, a disciple can achieve the spiritual goal. The text emphasizes that those who do not help in worldly life certainly will not help in spiritual matters, leaving only the Guru and one's own self as the ultimate supports.