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. The fuel behind worry, in other words, is the internal demand to know, in advance, that things will turn out fine: that your partner won’t leave you, that you will have sufficient money to retire, that a pandemic won’t claim the lives of anyone you love, that your favoured candidate will win the next election, that you can get through your to-do list by the end of Friday afternoon. But the struggle for control over the future is a stark example of our refusal to acknowledge our built-in limitations when it comes to time, because it’s a fight the worrier obviously won’t win. You can never be truly certain about the future. And so your reach will always exceed your grasp.

Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more than food, and the body more than clothes? Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? Can any one of you by worrying add a single hour to your life? (Emphasis mine.)