SUMMARY: — In view of a psychologic study on the complex personality of Francis of Assisi, under both the human and the spiritual aspect, the author indicates certain criteria as guide­lines. In order to determine precisely the relationship between spiritual authenticity and per­sonality, the following particular themes are delineated: the psycho-somatic nature of man; the maturative process of personality, the relationship between psychic maturity and spiri­tual maturity, the relevance of psychic maturity in the behaviour of the Saint of Assisi.