Jane Eyre...

"Gentle reader, may you never feel what I then felt? May your eyes never shed such stormy, scalding, heart-wrung tears as poured from mine. May you never appeal to Heaven in prayers so hopeless and so agonized as in that hour left my lips; for never may you, like me, dread to be the instrument of evil to what you wholly love."

(Chapter 27)

Jane says this as she is quietly leaving Thornfield in the early morning. She knows that she is bringing grief upon herself and Rochester, but she knows she must leave.