Craig: So you offer me success, in return you get my soul?
Mefistopheles: Oh no! I don't want your soul. I have more of those than I need. What I want...
Mefistopheles: ... is the love your greatest creation will inspire. Hell has a nice warm climate. But it lacks emotional warmth. Even I feel the need on occasion. The warmth of the love people will feel for your greatest creation will keep me warm for decades.
Craig: Hmmm... I have more ideas than I can use anyway. I guess I could give you one of them... That'd actually be kind of cheap.
Mefistopheles: I knew you'd come around. You need to sign on page 3.758.