Tell yourself that and you'll never have to worry
Because when you start to worry, later, you'll tell yourself that again
You'll say, Worry about it later
And thus you will never worry, due to infinite procrastination
(This is better than saying, Don’t ever worry, since planning to worry later is something that you can do in this moment)
And if that thing you're worried about ever happens, you can say: I'm glad I didn't worry about it until now!