Our past cannot be changed, and to be preoccupied with it is inefficient in time and effort. Likewise, by fretting over the future, we only exhaust ourselves, making us less able to effectively respond when the future is actually upon us. By worrying about a mishap that may or may not take place, we’re forced to undergo the event twice—once when imagining it and once again if and when we actually experience it.

- H.E. Davey