Your brain evolved to spot danger, not happiness. The limbic system's negative bias kept ancestors alive but now traps you in worry spirals over things that don't matter. Recognizing this wiring is the first step to rewiring it for joy.
The limbic system, the paleocortex, the monkey brain evolved into a world in which it always had to be on guard for danger. And so it developed a negative bias. In other words, it focuses much more on the dangers that it perceives around us and the downside of what could go wrong, because this would have great survival value back in those days. But in this world today, that can start a very bad spiral in the kinds of situations that we're in now.
