Human passions have mysterious ways, in children as well as grown-ups. Those affected by them can’t explain them, and those who haven’t known them have no understanding of them at all. Some people risk their lives to conquer a mountain peak. No one, not even they themselves, can really explain why. Others ruin themselves trying to win the heart of a certain person who wants nothing to do with them. Still others are destroyed by their devotion to the pleasures of the table. Some are so bent on winning a game of chance that they lose everything they own, and some sacrifice everything for a dream that can never come true. Some think their only hope of happiness lies in being somewhere else, and spend their whole lives traveling from place to place. And some find no rest until they are powerful. In short, there are as many different passions as there are people.
(From The Neverending Story by Michael Ende)