She thinks that happiness is a mat that sits on her doorway.

"She had wandered, without rule or guidance, into a moral wilderness. Her intellect and heart had their home, as it were, in desert places, where she roamed as freely as the wild Indian in his woods. The scarlet letter was her passport into regions where other women dared not tread. Shame, Despair, Solitude! These had been her teachers—stern and wild ones—and they had made her strong, but taught her much amiss."

-- From The Scarlet Letter by Nathaniel Hawthorne