We recoil from the notion that this is it—that this life, with all its flaws and inescapable vulnerabilities, its extreme brevity, and our limited influence over how it unfolds, is the only one we’ll get a shot at. Instead, we mentally fight against the way things are—so that, in the words of the psychotherapist Bruce Tift, “we don’t have to

Worry, at its core, is the repetitious experience of a mind attempting to generate a feeling of security about the future, failing, then trying again and again and again – as if the very effort of worrying might somehow help forestall disaster.