Key

 

A large solid lock was hung on the gate, and an iron rod was still unable to pry it open after a lot of effort. When the key came, his thin body got into the keyhole, and with only a slight turn, the big lock opened with a "slap". The iron rod asked strangely: "Why can't I open it even after so much effort, but you open it easily?"

The key said: "Because I know his heart best." Everyone's heart is like a locked door, no matter how thick you are, you can't pry it open. Only caring can turn oneself into a delicate key, enter the hearts of others, and understand others.