"At any given moment there is an orthodoxy, a body of ideas which it is
assumed all right-thinking people will accept without question.
It is not exactly forbidden to state this or that or the other,
but it is "not done"... Anyone who challenges the prevailing orthodoxy
finds himself silenced with surprising effectiveness. A genuinely
unfashionable opinion is almost never given a fair hearing, either in
the popular press or in the highbrow periodicals."