Once there was a beautiful house by a river. Everyone wanted to go into it, but there was a big lock (锁头) on the door.
One day, a stick (木棍) came. He thought, "I'm strong enough to open the door."He hit the lock, but the lock was still there.
A few minutes later, a key arrived and she wanted to go into the house, too. "You aren't strong enough to open it," the stick laughed at her. The key said nothing and went into the lock. Soon the door opened.
The stick looked at the key for a few minutes. Then he asked, "Why can you open the lock so easily?"
The key smiled,"Because I know the lock's heart very well."
Our life is just like this. When you want to do something, think about it carefully, and don't do something rude. And if you want to make friends, you should also know others' hearts first.
