It does good to no woman to be flattered by her superior who does not intend to marry her; and it is madness in all women to let a secret love kindle within them, which, if unreturned and unknown, must devour the life that feeds it; and, if discovered and responded to, must lead, ignis-fatuus-like, into miry wilds whence there is no extrication.
– Charlotte Bronte
Jane Eyre, Chapter 16. Jane is talking to herself about her feelings for Rochester and the situation she finds herself in. She concludes that a woman falling in love with her employer, someone who does not intend to marry her, is a really bad idea. It only leads to danger and heartache. She is embarrassed at allowing herself fall for the flattering attentions of Rochester.