As every past generation has had to disenthrall itself from an inheritance of truisms and stereotypes, so in our own time we must move on from the reassuring repetition of stale phrases to a new, difficult, but essential confrontation with reality. For the great enemy of truth is very often not the lie-deliberate, contrived and dishonest-but the myth-persistent, persuasive and unrealistic. Mythology distracts us everywhere.

John F. Kennedy: Containing the Public Messages, Speeches, and Statements of the President (ed. 1962)