People don't laugh over and over again because of the same joke, but they cry over and over again because of the same thing. Why?

A joke is only a temporary joke after all. The first time I listened to it, I found it fresh and interesting. The second time and the third time, I felt nothing new. Then I got bored and stopped laughing.

And sadness comes from the heart. There is one thing that touches you very much. It touches or hurts the weakest and youngest place in your heart, and makes you cry again and again unconsciously. This shows that the truest touch can have a permanent impact on people.