All these are like men who have stood on the high peak of a mountain and seen the horizon like a single ring and who then descend down different paths towards different towns, traveling slow or fast. It is right; there must be people travelling to different towns; there must be specialists; but shall no one behold the horizon? Shall all mankind be specialist surgeons or peculiar plumbers; shall all humanity be monomaniac? Tradition has decided that only half of humanity shall be monomaniac. It has decided that in every home there shall be a tradesman and a Jack-of-all-trades. But it has also decided, among other things, that the Jack-of-all-trades shall be a Jill-of-all-trades. It has decided, rightly or wrongly, that this specialism and this universalism shall be divided between the sexes. Cleverness shall be left for men and wisdom for women. For cleverness kills wisdom; that is one of the few sad and certain things.