Quote

“You,” I said, “a favourite with Mr. Rochester? You gifted with the power of pleasing him? You of importance to him in any way? Go! your folly sickens me. And you have derived pleasure from occasional tokens of preference—equivocal tokens shown by a gentleman of family and a man of the world to a dependent and a novice. How dared you? Poor stupid dupe!—Could not even self-interest make you wiser? You repeated to yourself this morning the brief scene of last night?—Cover your face and be ashamed! He said something in praise of your eyes, did he? Blind puppy! Open their bleared lids and look on your own accursed senselessness! It does good to no woman to be flattered by her superior, who cannot possibly intend to marry her;”

This quote shows how insecure Jane feels about herself compared to Blanche. She feels that loving Mr.Rochester is a foolish mistake, and nothing is going to happened between the two of them, since she isn't good enough for him.