In pursuit of a pure psychology the psychologist must never allow the validities, no matter how diverse, of the persons who make up his subject matter to be valid for himself; during his research he must have and take up no position of his own in regard to them; and this must hold universally and in advance in regard to all the intentionalities of these persons which are as yet unknown, which lie in the depths of their lives and are still hidden from the psychologist, regardless, of course, of whether they axe conscious or unconscious intentionalities in the special sense for the person himself.