Having established this first point, our psychiatric interest increases. When a delusion cannot be dissipated by the facts of reality, it probably does not spring from reality. Where else then does it spring from? Delusions can have the most various contents; why is the content of it in this case jealousy? What kind of people have delusions, and particularly delusions of jealousy? Now we should like to listen to the psychiatrist, but he leaves us in the lurch here. He considers only one of our questions. He will examine the family history of this woman and will _perhaps_ bring us the answer that the kind of people who suffer from delusions are those in whose families similar or different disorders have occurred repeatedly. In other words, this lady has developed a delusion because she had an hereditary predisposition to do so. That is certainly something; but is it all that we want to know? Is it the sole cause of her disease? Does it satisfy us to assume that it is unimportant, arbitrary, or inexplicable that one kind of delusion should have been developed instead of another? And are we to understand the proposition—that the hereditary predisposition is decisive—also in a negative sense; that is, that no matter what experiences and emotions life had brought her she was destined some time or other to produce a delusion? You will want to know why scientific psychiatry gives no further explanation. And I reply: “Only a rogue gives more than he has.” The psychiatrist knows of no path leading to any further explanation in such a case. He has to content himself with a diagnosis and, in spite of wide experience, with a very uncertain prognosis of its future course.