In the excerpt from Cormac McCarthy's "The Crossing," the speaker reflects on the cyclical nature of life and knowledge. As they reach the end of a subject, they realize that each conclusion compels them to start anew. This sense of renewal is portrayed as an essential part of existence, hinting that wisdom often comes from embracing uncertainty and the need to learn again.

Additionally, the speaker grapples with the memories of a once-bright world that now seems distant and fragile. This past is contrasted with a deeper understanding they have gained over time, suggesting that although the initial light may fade, what they have discovered subsequently holds greater significance and resilience. It speaks to the journey of self-discovery and the transformative power of experience.