Humans have extraordinary brains but they’re difficult to drive.
The problem is that our brain is so powerful — so good at imagining the various possible states of reality — that our body doesn’t realize it’s not real.
A few hundred years ago, some writer who fancied himself a philosopher pointed this out with the witty phrase, “My life has been filled with terrible misfortune; most of which never happened.”
We’ve all drifted into a dangerous thought and, before you know it, you’re there: heart pumping and mind racing, vividly day-dreaming the worst possible outcome as if it were happening right now.
But it’s not really happening.
It almost certainly never will.
And even if it does, worrying about it won’t help.
So you may as well think about something nice instead.