Hypnosis was the means used to enable the physician to penetrate deeply into the forgotten memories, for it was found through hypnosis that these lost incidents and circumstances were not really lost at all but only dropped from consciousness, and were capable of being revived when given the proper stimuli. The astonishing part about it was that with the revival of these memories and their accompanying painful and disturbing emotions, the symptoms disappeared. This led naturally to the conclusion that these symptoms were dependent upon some emotional disturbance or psychic trauma which had been inadequately expressed, and that in order to cure the patient one merely had to establish the connection between the memory and the emotions which properly belonged to it, letting the emotion work itself out through a reproduction of the forgotten scene. With further investigation Freud found that hypnosis was unnecessary for the revival of the forgotten experiences, and that it was possible to obtain the lost emotional material in the conscious and normal state. For this purpose the patient was encouraged to assume a passive, non-critical attitude and simply let his thoughts flow, speaking of whatever came into his mind, holding nothing back. During this free and easy discussion of his life and conditions, directed by the law of association of ideas, reference was invariably made to the experiences or thoughts which were the most affective and disturbing elements. It was seen to be quite impossible to avoid this indirect revelation because of the strength of the emotions surrounding these ideas and the effect of the conscious wish to repress unpleasant feelings. This important group of ideas or impressions, with the feelings and emotions clustered around them which are betrayed through this process, was called by Jung a _complex_. However, with the touching of the _complex_ which always contains feelings and emotions so painful or unpleasant as to be unacceptable to consciousness, and which are therefore repressed and hidden, great difficulties appeared, for very often the patient came to a sudden stop and could apparently recall nothing more. Memory gaps were frequent, relations twisted, etc. Evidently some force banished these memories so that the person was quite honest in saying that he could remember nothing or that there was nothing to tell. This kind of forgetfulness was called _repression_, and is the normal mechanism by which nature protects the individual from such painful feelings as are caused by unpleasant and unacceptable experiences and thoughts, the recognition of his egoistic nature, and the often quite unbearable conflict of his weaknesses with his feelings of idealism.