This dream is a typical example of the prospective and teleological function of dreams in general, a function that has been especially emphasised by my colleague Dr. Maeder. If we adhered to the one-sidedness of sexual interpretation, the real meaning of the dream would escape us. Sexuality in dreams is, in the first instance, a means of expression, and by no means always the meaning and the object of the dream. The unfolding of the prospective or teleological meaning of dreams is of particular importance as soon as analysis is so far advanced that the eyes of the patient are more easily turned upon the future, than upon his inner life and upon the past. In connection with the application of symbolism, we can also learn from the example furnished us by this dream, that there can be no fixed and unalterable dream symbols, but at best a frequent repetition of fairly general meanings. So far as the so-called sexual meaning of dreams, in particular, is concerned, my experience has led me to lay down the following practical rules: If dream analysis at the beginning of the treatment shows that the dream has an undoubted sexual meaning, this meaning is to be taken realistically; that is, it is proved thereby that the sexual problem itself must be subjected to a careful revision. If, for instance, an incest phantasy is clearly shown to be a latent content of the dream, one must subject the patient's infantile relations towards his parents and his brothers and sisters, as well as his relations towards other persons who are fitted to play the part of his father or mother in his mind, to a careful examination on this basis. But if a dream that comes in a later stage of the analysis has, let us say, an incest phantasy as its essential content, a phantasy that we have reason to consider disposed of, concrete value must not be attached to it under all circumstances; it must be regarded as symbolic. In this case symbolic value, not concrete value, must be attached to the sexual phantasy. If we did not go beyond the concrete value in this case, we should keep reducing the patient to sexuality, and this would arrest the progress of the development of his personality. The patient's salvation is not to be found by thrusting him back again into primitive sexuality; this would leave him on a low plane of civilisation whence he could never obtain freedom and complete restoration to health. Retrogression to a state of barbarism is no advantage at all for a civilised human being.