The author discusses Freud's 'contention that the origin of neurosis is exclusively sexual'. Quite generally the author considers it as a serious mistake to ascribe the origin of neurosis to one single factor. He prefers a 'pluralistic hypothesis'. Many neurotic conditions may be explained on the basis 'of the frustration of effective aggression'. It is not a sacrilege to misinterpret Freud and then to go through the trouble of correcting such misinterpretation (footnote p. 120), but it is annoying to the reader to have to go with the author through complicated pathways only to find himself finally back at the starting point.