Justice would not be done to the genius of Jung if we were to try to understand only the scientific and professional aspects of his career. His was an extraordinary personality, combining the keenest contradictions. Contemplativeness and childlike cheerfulness, delicate sensibility and robust simplicity, cold reserve and true devotion, rigor and tolerance, humor and severity, aloofness and love for mankind, were equally prominent traits in his makeup. Except when he was troubled by the birth pangs of a new book, he generously shared his insights and explanations, both in conversation and in letters