Milton does a masterful job of portraying Satan's guilt in Book IV of Paradise Lost. At this point in the poem, Satan has escaped hell, and has just taken his first look into the created world, but he has no sense of joy. Milton shows great psychological insight into the effects of sin and guilt. This is a moment when Satan should be glad, but instead,

     . . . Horror and doubt distract
     His troubled thoughts, and from the bottom stir
     The hell within him; for within him Hell
     He brings, and round about him, nor from Hell
     One step, no more than from Himself, can fly
     By change of place. Now conscience wakes despair
     That slumbered; wakes the bitter memory
     Of what he was, what is, and what must be
     Worse; of worse deeds worse sufferings must ensue.

Lines 19-26

From Marilynne Robinson's Home:

She did remember once, when Ames was at dinner years earlier, his mentioning to her father that a local man, unchurched, noted for bursts of rage and for a particular hostility toward children, his own included, had come to the parsonage at midnight to consider his soul. Ames had said, "It's like a bad tooth--it acts up when everybody else is sleeping, and it's not the kind of problem you want to deal with yourself."