The story happened in ancient Greece. A man noticed the great storyteller Aesop was playing childish games some little boys. He (laugh) at Aesop, asking him why he wasted his time on such unworthy activity.
Aesop responded by picking up a bow, (loosen) its string, and placing it on the ground. Then he said to the man, "Now, solve the riddle, if you can. Tell us what the unstrung(断弦的)bow (mean)."
The man looked at it for a long time had no idea what point Aesop was trying to make. The moralist explained, "If you keep a bow always bent, it will break at last, but if you let it go loose (occasional), it will be much (fit) for use when you want it."
So it is with us. Our minds and (body) are like bow. When constantly under pressure, we can eventually break. We need time to relax (our). Taking time (watch) the clouds, enjoy a breeze or take a walk is necessary if we are to be our best later.