“[M]ental health is based on a certain degree of tension, the tension between what one has already achieved and what one still ought to accomplish, or the gap between what one is and what one should become.”
–Viktor Frankl
The healthy state of humans is mild existential terror. In Frankl’s words, “a certain degree of tension.”
For 99% of human history, this was true not in the Frankl-meaning-of-life sense, but in the my-environment-is-hostile-and-trying-to-kill-me-holy-shit-is-that-a-lion?-RUN! sense.
Humans lived in a constant state of mild existential terror because death could be on the other side of the rock at any moment.
We evolved in a world with high levels of day-to-day uncertainty and illegibility. Whether or not a hunter was able to kill an antelope wasn’t a sporting concern, but an existential one.
Given this reality, humans worked incredibly hard to reduce uncertainty and volatility. The brain of homo sapiens developed to fulfill a primary role much like a lawyer’s primary role in a corporation: always looking for the worst possible outcome and trying to avoid it. (The analogy holds for its secondary role as well: trying to sleep with everything that walks .)
For the majority of human history, this was adaptive. In the last century, it has become maladaptive.