Over the last few days I have been reading Carl Gustav Jung's _Seven Sermons to the Dead_. The great psychoanalyst wrote them in 1916, after he had a vision of several spirits returning from Jerusalem. Now, there are three possibilities. The first is that the spirits of the dead exist, and Jung was able to see them because he possessed uncommon faculties. The second is that the spirits do not exist nor did Jung see them; he claimed to see them because he was a charlatan. The third is that spirits do not exist but Jung really saw them because he was a psychopath. Now, according to Occam's razor, the first hypothesis must be given up, because _entia non sunt multiplicanda praeter necessitatem_. So Jung was either a charlatan or a psychopath.