The word revelation is related to the word reveal, because revealing is the action of showing something that was previously covered up or unknown.
1. countable noun
A revelation is a surprising or interesting fact that is made known to people.
Synonyms: disclosure, discovery, news, broadcast
Middle English (in the theological sense): from Old French, or from late Latin revelatio(n-), from revelare ‘lay bare’ (see reveal). Sense 1 dates from the mid 19th century.
… but the revealing discourses, which artificially crisscross our environment and subject us to the yoke of the unanimous, have effects more silently perverse; for while claiming to offer a privileged means of access to reality, they cover it and irremediably separate us from it.
… in front of the exposure of the lie which reduces the universe to its counterfeit, the weapon of the art is the fiction. Because art has the honesty of being a fiction that gives itself as such, it has the power to denounce all those who try to pretend to be true.