How many languages are there?

One day, three scholars went to visit the great calligrapher Wang Xizhi. When I arrived at the door of Wang Xizhi's house, I saw the word "heart" written on the door. A scholar said, "Let's go home and come back another day." Two other scholars said, "Since I'm here, why should I go back?" So I knocked at the door, no one answered, so I had to leave.

A few days later, the three men visited again. At this time, the words on the door have been replaced by the vigorous and powerful word "wood". The scholar said, "I can see you today, sir." When he knocked at the door, Wang Xizhi personally came out to open the door to meet him.

Answer:

There is a word "heart" written on the door, which means "boring" and does not receive friends.

The word on the door has been replaced by the vigorous and powerful word "wood", which is the "leisure" for receiving friends.