I read a lot of books but I think most forgot me. What is the point of reading if you forget like this?

There was once a great Guru. They had a lot of students reading. Once a student came to them and asked ′′ I've read many books but I've forgotten most of them. Then what's the point of reading and what's the point?

Guru Ji just smiled and didn't give any answer. After some days, Guru Ji gave that student a dirty pigeon and said go fill it with water. The student was surprised at first but to avoid the permission of the Guru, he went to take water towards the river. When the water was filled, the water lasted for some time and the whole was flowing. After trying so many times, the student came back and was sad and told the Guru Ji that I could not fill the water. I have failed.
Guru ji again smiled and said ′′ You did not fail.
Looking at the moon, she's like new. All this happened when you were trying to bring water.
Asked last time not what is the purpose of reading. Let's understand by taking an example of a chanani.
The heart of the heart
Water - Knowledge
River - Book
Even if everything is remembered or not. But reading will definitely clear the mind. Reading always has a deep impact on the mind. That knowledge will sit in your absconding and will come out on time at the right time.