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Fanaticism is a belief or behavior involving uncritical zeal or with an obsessive enthusiasm. Philosopher George Santayana defines fanaticism as "redoubling your effort when you have forgotten your aim". The fanatic displays very strict standards and little tolerance for contrary ideas or opinions. Tõnu Lehtsaar has defined the term fanaticism as the pursuit or defence of something in an extreme and passionate way that goes beyond normality. Religious fanaticism is defined by blind faith, the persecution of dissents and the absence of reality. In his book Crazy Talk, Stupid Talk, Neil Postman states that "the key to all fanatical beliefs is that they are self-confirming.... fanatical not because they are 'false', but because they are expressed in such a way that they can never be shown to be false." The behavior of a fan with overwhelming enthusiasm for a given subject is differentiated from the behavior of a fanatic by the fanatic's violation of prevailing social norms.