"...Lucifer is connected with the experience of breathing of the in-breathing and the out-breathing. The relationship between a man's breathing and the functioning of his organism as a whole must be absolutely regular and normal. The moment the breathing process is in any way disturbed instead of remaining the unconscious operation to which no attention need be paid it becomes a conscious process of which we are more or less dreamily aware. And when to put it briefly the breathing process becomes too forceful when it makes greater claims on the organism than the organism can meet then it is possible for Lucifer (not he himself but the hosts belonging to him) to enter with the breath into the organism. I am speaking here of a familiar experience of dreamlife. It may arise in many forms and with growing intensity. A nightmare in which the disturbed breathing process makes a man conscious in dream so that experiences of the spiritual world intermingle with the dream and give rise to the anxiety and fear which often accompany a nightmare - all such experiences have their origin in the Luciferic element. When instead of the regular breathing there is a feeling of being choked or strangled this is connected with the possibility that Lucifer may be mingling with the breathing..."