Nobody knows what the cause is, though some pretend they do; it like some hidden assassin waiting to strike at you. Childless women get it, and men when they retire; it as if there had to be some outlet for their foiled creative fire.
W. H. AudenWe do not change as we grow up. The difference between the child and the adult is that the former doesn't know who he is and the latter does.
W. H. Auden