You do not have to be specialists to realise the extraordinary demand for psychology, its description, its application in the third millennium, so obscure and chaotic due to the development of modern technologies (Internet, mobile phones, etc.) More or less explicitly, our contemporaries want to understand and be understood; “understand” because it is the first step towards absolute freedom; “be understood” since it is the necessary condition to be recognized, accepted, integrated. We can question the origins of these needs and of this contemporary anxiety: once problems were faced by a small group of thinkers - belonging to the so-called "intellectual class"; today they have involved everyone. Why? The first answer is quantitative: men are more numerous, therefore mutual problems have become more frequent; they also live in big cities, which have nothing to do with those of the past. Due to demographic over-density, disputes and conflicts are more frequent. In the empty world of some millennia ago, man was a wolf to another man. Today, in the crowded spaces of our contemporary world, man is an annoyance to the…