This is the seminal work by Dr. Roberto Assagioli, M.D. on a psychological model he developed called psychosynthesis. He was a contemporary and colleague of both Freud and Jung and had studied the work of both schools associated with them. He saw psychosynthesis as an evolution of the psychological thinking of the time to include all of a person's body, mind & spirit in the process of psychiatry, psychotherapy and self knowledge. This book contains many of his early writings describing psychosynthesis and its application to psychotherapy and self improvement. It is an essential work for understanding the principles, techniques and application of psychosynthesis both as applied in various clinical settings as well as for the personal growth of the reader.