Is this the region?
"The mind is its own place, and in itself
Can make a Heavn' of Hell, a Hell of Heav'n."
Lines 254-5 of Paradise Lost by John Milton. It's an excellent read so far and I'm getting along with it much better than I am with Don Quixote (so long...so repetitive). There's a lot of memorable lines and the blank verse makes it very readable. Satan is so charismatic.