"In the study of dream psychology we encounter far-reaching philosophical and even religious problems to the understanding of which the phenomenon of dreams has already made decisive contributions.  But we cannot boast that we are, at present, in possession of a generally satisfying theory or explanation of this complicated phenomenon.  We still know far too little about the nature of the unconscious psyche for that.  In this field there is still an infinite amount of patient and unprejudiced work to be done, which no one will begrudge." (CW8, para. 569)