This book aims to rescue the subjectivity, the spirituality of the human person, whatever the scientific or non-scientific positions that claim to define and characterise it. Subjectivity constitutes at least half of man's destiny. The health of this subjectivity will determine the possibility of well-being, of realising projects, of sustaining values, of having a share of happiness. Today, we should react against the application of an excessively analytical and mechanistic science that biologises the soul too much but, at the same time, try not to fall into the risky opposite of psychologising the physical to the extreme. The purpose of medicine is not to produce pathology but to cure or improve the sick, even if many treatments have little connection with morbid phenomena and their explanations. The reinstatement of the sciences of the spirit and the relationships of the whole of life should always be part of the foundations of a holistic medicine for people. The outer world and the inner world are inseparably linked in our brains.