In State Qi, there was a man who worried all day. He often thought to himself, “Will I die if the sky falls down?”
Therefore, the man would neither sleep nor eat well. He warned his neighbors, “The sky will fall down and it will crush (压碎) us to death. The earth will collapse and it will bury us. Be careful!”
Day after day, everything was the same as before.
A neighbor comforted the man, “Everything, like the Sun, the Moon and the stars, moves according to the law of nature. There is nothing to worry about.”
Finally, the man understood that.
Don't always think about things that will probably never happen. Worrying too much will not do you any good.

One possible version: it was really unnecessary to worry about things that were unlikely to happen. He stopped worrying too much all the time.