What is truth? We must adopt a pragmatic definition: it is what is believed
to be the truth. A lie that is put across therefore becomes the truth and
may, therefore, be justified. The difficulty is to keep up lying... it is
simpler to tell the truth and if a sufficient emergency arises, to tell one,
big thumping lie that will then be believed.
-- Ministry of Information, memo on the maintenance of
British civilian morale, 1939
