One day in class, the teacher asked the students a funny question, “What is the fastest thing?” Hearing the question, everyone started thinking. The first student stood up and said, “Sir, the fastest thing is light, because light travels a long distance in an instant.” The teacher nodded and agreed. The second student said, “Sir, time is the fastest, because it never stops, it always moves forward.” The teacher was happy to hear this too.

Then the third student stood up and said, “Sir, my younger brother’s head is the fastest!” The whole class laughed. The teacher was surprised and asked, “Why?” The student said, “Sir, he does things without thinking—first work, then thinking!” The teacher smiled and said, “You are right, working without thinking for a long time is really very fast, but it does not always give good results.” With this, everyone understood that in addition to being fast, it is also important to think correctly.