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Mefistofel is a little more faithful to Goethe's Faust in this aria:

Lyrics and translation.

After the encounter with the demon, Faust is still curious, and fascinated enough to want to do a deal with him.

I'd like to say that this kind of encounter would scare me too much to contemplate trying to deal with Mephistopheles. But less dramatic denials might be enticing, and denials snowball to the point that you can deny what is in front of your eyes, even when it threatens to kill you.