"This book is the fruit of nearly twenty years of work in the field of practical psychology. It was born gradually in my thoughts, partly from the countless impressions and experiences of psychiatry and neuromedical practice, partly from dealing with people from all walks of life, and from my personal discussions with friends and enemies, finally, from a critique of my own psychological characteristics. I decided not to burden the readers with case studies, rather I tried to embed my thoughts filtered from experience into the already existing historical and terminological knowledge." (C.G. Jung)