People forget a lot as they age.

One day, the teacher decided to test the intelligence of the students in the class. Everyone was asked to be ready. But when the teacher came to the class, he realized that he himself had left the test book at home. The students looked at each other in surprise. Then one of the students said politely, “Sir, only humans make mistakes.” The teacher admitted his mistake with a smile and said, “The biggest lesson for you today is that you must have the courage to admit your own mistakes before you catch the mistakes of others.” Although there was no exam that day, everyone learned a valuable lesson in honesty, humility, and responsibility.