In ancient times, there was a man who sold spears as well as shields.
One day, he hawked his wares at the market and was very pleased with himself. He held up a shield and said: "My shield is very strong. No matter how sharp a spear is, it cannot pierce my shield."
After that, he held up his spear and bragged: "My spear is very sharp. No matter how strong a shield is, my spear can pierce it.
When the people standing by heard this, they laughed up their sleeves. One of them asked him:
"According to what you said, your spear is the sharpest. No matter how strong a shield is, your spear can pierce it. Your shield is also the strongest. No matter how sharp a spear is, it cannot pierce your shield. Now, if I poke your shield with your spear, what will be the result?"
The man was so embarrassed that he could not utter a single word.
In the past, a man bragged about his bow: "There is no bow better than mine. It doesn't need any arrow!"
Another man bragged about his arrow:"There is no arrow better than而ne. It doesn't need any bow!"
At that time, a man good at archery happened to pass by and heard their dialogue. He said:
"You are both wrong. One cannot shoot an arrow without a bow; and without an arrow, how can one hit the target?"
Thereupon, the man good at archery asked them to take out their bow and arrow. Then he showed them how to shoot at the target with a bow and an arrow.