Once we were very different — our psyches constantly at war — [so] we struck a bargain, a spiritual compromise. We would grow more like each other, there would be a balance, but a bargain with a demon is no bargain at all. Demons cheat; it is their nature. Oh yes, I have grown more like Etrigan, and he… he too has grown more like Etrigan.

Jason Blood, Saga of the Swamp Thing #27 ("By Demons Driven") - Swamp Thing (1983–1987)