Why are worldly relationships considered insufficient for spiritual progress, and what is the recommended alternative focus for a seeker?

The teachings in Chapter 45 assert that worldly relationships cannot be fully relied upon for achieving one's spiritual goal because they are inherently transient and self-interested. The text notes that a mother and father show affection, a son looks at the wealth he can claim, and a wife mourns her own potential widowhood, but none are a true companion on the spiritual path. Upon final reflection, the only one who remains is one's own self. Therefore, a seeker must give up hope in others, cultivate strong self-confidence, and recognize the Guru as the true Brahman, the eternal reality, while renouncing the transient world.