Nathaniel Hawthorne, letter to Henry Wadsworth Longfellow (July 4, 1837):
I have secluded myself from society; and yet I never meant any such thing, nor dreamed what sort of life I was going to lead. I have made a captive of myself and put me into a dungeon; and now I cannot find the key to let myself out—and if the door were open, I should be almost afraid to come out.
Nathaniel Hawthorne, The House of the Seven Gables
, chapter 11:
For, what other dungeon is so dark as one's own heart! What jailer so inexorable as one's self!