He gives the example of a teacher. A teacher knows what students should learn, but doesn't know how to make them pay attention. On the other hand, people in the entertainment industry know how to stir people's hearts but don't know what to teach.
他舉例，老師知道學生該學什麼，但是不知道該如何讓學生專心；娛樂業者懂得如何鼓舞人心，但卻不知該教什麼？