A person who thinks all the time eventually runs out of reality and starts recycling thoughts. At first, it feels productive, but after a while your brain becomes an AI trained exclusively on its own bad takes. With no new input, your only source is yourself, so congratulations—you've cited your own imagination 4,000 times. The brain is supposed to process reality, but some people accidentally leave it on offline mode until it starts writing fan fiction about the universe. Eventually your thoughts become peer-reviewed exclusively by other thoughts, and your mind turns into a group chat where everyone has the same opinion. While everyone else is touching grass, you're six hours deep into an argument with a version of yourself that doesn't even exist. The human brain wasn't designed to be left alone with itself for that long. It starts making conspiracy theories about your own personality. At some point you're no longer observing reality—you're just watching your brain react to screenshots of reality. Thinking is like making photocopies: the first few are useful, but by the fiftieth copy all you've got is blurry nonsense that somehow feels profound. The danger of thinking too much isn't that you become smarter—it's that your brain starts citing itself as a primary source.