The dominant impression conveyed by Faustus's language, in this scene and elsewhere, is one of resignation, in my view. Though he is striving for something beyond the real world, he seems washed out, emptied of hope, as he alludes to the "gloomy shadow of the night." The appearance of a devil (prior to Mephistopheles's entrance) provokes not so much consternation by Faustus as a kind of unsurprised disgust:
Thou art too ugly to attend on me.
Go, and return an old Franciscan friar,
That holy shape becomes a devil best.
This last statement is perhaps the most revealing one in the scene. It conveys Faustus's rejection of "holiness," and therein lies the essence of his quest. Faustus, even in his resigned mindset, seeks an ultimate experience beyond the bounds of what has been permitted to man. This entails, to put it simply, a rejection of religion:
So Faustus hath already done,
And holds this principle,
There is no chief but only Beelzebub,
To whom Faustus doth dedicate himself.
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