Unfortunately, in our society, many people think that only good experiences and success are important : passing exams ; winning a match; earning lots of money. We only talk about the good things that we have done. At the same time, we criticize every mistake that other people make and try to limit every possibility of bad experiences; parents don’t let their children play outside and climb trees, or walk to school on their own; and we stay with what we know, living in flats with locked doors and bars on the windows, behind walls with guards.