He makes a bargain with Faust: Mephistopheles will serve Faust with his magic powers for a set number of years, but at the end of the term, the Devil will claim Faust’s soul, and Faust will be eternally enslaved. During the term of the bargain, Faust makes use of Mephistopheles in various ways.
Isn’t it a wonderful and divine gift when one can keep going back to everything one has ever done and re-talk about it.
OMG : The girl has gone all posh :o)
My theory – 99.9% made the same deal as Faust. And none of them realise it.