Maurice Bloomfield,
Cerberus, the dog of Hades: The history of an idea
“ Sun and moon course across the sky: beyond is the abode of light and the blessed. The coursers are at one moment regarded as barring the way to heaven; at another as outposts who may guide the soul to heaven. In yet another mood, as they constantly, day by day, look down upon the race of men, dying day by day, they are regarded as picking daily candidates for the final journey. In due time Yama and his heaven are degraded to a mere Pluto and hell; then the terrible character of the two dogs is all that can be left to them. ”
