Before a master performing on the stage, his disciples told him that his shoelaces were loose. The master nodded to thank him and squatted down to fasten it carefully. When the disciples turned around, they squatted down again to loosen their shoelaces. A bystander asked puzzled: Master, why do you loosen your shoelaces again? The master answered: because I played a tired traveller, the long journey made his shoelace loose. Then why don't you tell your disciples directly? He could find my shoelaces loose carefully, and told me enthusiastically that I must protect his enthusiasm and encourage him in time. As for the reason of unlocking the shoelaces, there will be more opportunities to teach him to perform in the future, and we can talk about it next time.
A person can only do one thing at a time, knowing to focus on the key points is the real talent.