There is much in Jane Eyre that speaks to gender roles in society. This quote, taken from Chapter Twelve, captures Jane's musings on the 'restraints' place on women by society:
Women are supposed to be very calm generally: but women feel just as men feel; they need exercise for their faculties, and a field for their efforts as much as their brothers do; they suffer from too rigid a restraint, too absolute a stagnation, precisely as men would suffer; and it is narrow-minded in their more privileged fellow-creatures to say that they ought to confine themselves to making puddings and knitting stockings, to playing on the piano and embroidering bags. It is thoughtless to condemn them, or laugh at them, if they seek to do more or learn more than custom has pronounced necessary for their sex. (from Chapter 12)
Jane's thoughts and feelings of restriction at Thornfield translate into thoughts of larger limitations placed on women in general in society. If this quotation was used as part of a structured question, the question might ask for examples from the text of how Jane was similarly restricted by the men in her life throughout the story.
Your question is rather ambiguous, but it seems that you are asking which type of quotations one would seek in order to answer an essay question.
Since Charlotte Bronte's novel Jane Eyre is a character study, you may wish to make note of those passages that provide insights into her character development. For instance, when Jane attends Lowood School for girls, she is moved by her relationship with Helen and makes several remarks that influence future actions. Also, she makes note of the teacher who is kind to her.