The book at hand contains the prerequisites for avoiding mental disorders, as well as the conquest and maintenance of mental health and well-being, according to ancient Greek philosophical psychology.It is natural to be aroused by the question of how ancient Greek philosophical psychology can effectively address the psychological problems of modern humans 2,500 years later, taking into account the tremendous advancement of science. The main reasons why ancient Greek philosophical psychology remains the most modern scientific tool for the effective conquest of mental balance and well-being are as follows:

•  the knowledge incorporated into ancient Greek philosophical psychology was a reflection of the knowledge of the entire ancient world
• the functioning of the human brain, and therefore its problems, the externalization of these problems through behavior, as well as the causes that create them, have not been modified in the last 2,500 years
•  the views of ancient Greek philosophical psychology are free from commodification (S. Freud) and the pursuit of maximizing the profits of pharmaceutical, insurance, etc. companies (I. Yallom, et al.).
• We note that modern psychology has copied the positions of ancient Greek philosophical psychology regarding the prerequisites for avoiding mental disorders and achieving mental health and well-being. The ultimate purpose of the book at hand, through the identification and analysis of the prerequisites for avoiding mental disorders and achieving mental health and well-being, is to contribute to the struggle of those individuals who - in collaboration with their psychotherapist - have not only identified and accepted their psychological problems but also strive to shape that way of thinking that will free them from the bonds that keep their soul in a constant state of turmoil from anxiety, fears, complexes, etc.