Once there a was great teacher who had many students.
Once one of the students came to him and asked “I have read lots of books but forgotten most of them. What's the purpose of reading?”
The teacher didn't give him an answer at that time.
After few days teacher gave that student a sieve which was in dirty and in very bad condition as shown in the picture. (Figure 1)
The teacher asked the student to fetch water from a nearby river in this sieve.
The student didn't like the idea but he could not refuse his teacher.
He went to river filled sieve at the river and started his return journey.
Few feet as he walks all water in the sieve was drained through holes.
Then again he went to the river and filled sieve.
He did this all day but could not complete the task assigned by his teacher.
He returned to the teacher with a sad face and said “I am unable to fetch water with this sieve. I am failed.“
His teacher smiled at him.
No! You didn't fail.
Look at the sieve.
It has become like new. It got clean when you were trying to fetch water.
The teacher then explained the true motto behind this task.
He said “Last time you asked me what is the purpose of reading if you don't remember what you read. Now take this example of the sieve."
Sieve = Mind
Water = Knowledge
River = Book
Even if you can't remember its ok!