I heard this recently on Sam Harris’ Waking Up App:

I noticed this at dinner the other night with my family. Everyone seemed to be in a fairly mediocre frame of mind. We were all in some way disgruntled or stressed out. I had a million things I was thinking about and I suddenly noticed how little joy we were all taking in one another’s company. And then I thought, “If I had died yesterday, and could have the opportunity to be back with my family, I thought of how much I would savor this moment right now.” And it totally transformed my mood. It gave me instantaneous access to my best self, and to a feeling of pure gratitude for the people in my life. Just think of what it would be like to lose everything, and then be restored to the moment you’re now in. However ordinary. You can reboot your mind in this way. And it need not take any time.

This is spot on. It reminds me of a thought I often have after a near-catastrophe (e.g., someone almost running their car into your car on the highway). I tell myself:

This is the same result as if the accident DID happen and I suffered great bodily injury with no hope of fully recovery. But then a magic genie appears and offers to revers time, making sure the accident didn’t happen. Two versions of the same result. This helps me appreciate my good fortune of almost being maimed in an accident rather than being angry that a reckless driver almost caused me to be badly injured.