The quote "He existed, then he didn't. The world spins on, indifferent to the mess." from J. Courtney Sullivan's book Maine reflects the fleeting nature of human presence and the world's relentless progression. It highlights how individual lives can be transient, yet life and the universe continue regardless of personal dramas or losses.
This statement emphasizes the idea that personal struggles or tragedies may seem monumental to those involved, but in the grand scheme, they are just small moments in an ongoing, indifferent world. It serves as a reminder of life's continuous flow, unaffected by individual insecurities or hardships.