A movie holds the power of suspense and holds your interest as long as you remain ignorant of the outcome. The drama of our daily life is no different. You must know how to keep a balance between knowing and not knowing, between love and hate, between eating and defecating, etc. Everything must be done in proper amounts. As a result, there are many kids who one day simply get overloaded, and their minds just go blank.
Some kids even forget who their own parents are.
This sort of dementia occurs more often than you'd think. It happens especially among kids who grow up with rich parents, insisting that their children follow in their footsteps. Sometimes a guy will tell his girlfriend that he'll call. But when he doesn't, and his girlfriend asks why, he says, I forgot. By this we do not mean being familiar with the explanation of the hexagrams, or of what the individual lines of the hexagrams symolize.