Accordingly, we get ourselves laughed at for proclaiming that God will one day judge the world. For, like us, the poets and philosophers set up a judgment-seat in the realms below. And if we threaten Gehenna, which is a reservoir of secret fire under the earth for purposes of punishment, we have in the same way derision heaped on us. For so, too, they have their Pyriphlegethon, a river of flame in the regions of the dead. And if we speak of Paradise, the place of heavenly bliss appointed to receive the spirits of the saints, severed from the knowledge of this world by that fiery zone as by a sort of enclosure, the Elysian plains have taken possession of their faith.
Tertullian
Apology
Chapter XLVII