George: You know the anxiety you feel on a date? That's what I have every day now. My worst nightmare's come true...every day is a date.
Jerry: That's one of Dante's nine stages of hell, isn't it?
This is reference to the Divine Comedy, written by Dante Alighieri in the 1300s. In the first part of the poem, called Inferno, Dante describes hell as nine circles of suffering inside Earth.