"Historical questions are always monographic, either because of the limited manner in which the subject is conceived or because of the specialization of treatment. For history this is indeed necessary, since the academic division of labour imposes certain limitations. But when the empirical investigator glories in his refusal to go beyond the specialized observation dictated by the traditions of his discipline, be they ever so inclusive, he is making a virtue out of a defense mechanism which insures him against questioning his presuppositions."
Karl Mannheim, Ideology and Utopia. p 90.