One does not have to be a specialist in religious history or the science of symbols in order to yield to the fascinating variations on the meanings of the Holy Grail. This strange vessel was undoubtedly already imbued with secret traditions when from the end of the 12th century to the end of the 13th century it was briefly resplendent with all the glory conferred by legend, before disappearing into the semi-darkness of mystery until Wagner's Parsifal brought it back to light by drawing from it the redemption of the suffering inflicted by Schopenhauer's world.