In his book "Holy Fools in Byzantium and Beyond", Ivanov described "holy fool" as a term for a person who "feigns insanity, pretends to be silly, or who provokes shock or outrage by his deliberate unruliness." He explained that such conduct qualifies as holy foolery only if the audience believes that the individual is sane, moral, and pious. The Eastern Orthodox Church holds that holy fools voluntarily take up the guise of insanity in order to conceal their perfection from the world, and thus avoid praise.