Contrast Elizabeth Bennet's critical temperament with Jane's serenity in Pride and Prejudice.
Elizabeth tells Jane that she is too nice. She adds that Jane refuses to find a fault in anyone. Elizabeth speaks in a straight forward manner. She is quite bold in her speech to Darcy. She accuses him of being prideful or snobbish, adding that she would not consider marrying him if he were the last man on earth.
Also, Elizabeth is frank or blunt when Lady Catherine questions her on her schooling and personal life. She refuses to tell her age, saying you could hardly expect me to share such information.
Jane is sweet and serene. She is considerate and caring. She sees the good in people. She is also modest and mild-mannered. In reference to her relationship with Mr. Bingley, Jane's lack of sharing her feelings is interpreted as indifferent by Darcy and even Mr. Bingley. For this reason, Mr. Bingley does not pursue a relationship with Jane in the beginning. Jane was not indifferent, she is just quiet and reserved.
Elizabeth is outspoken. The two sisters are opposites in temperament. Jane is trusting. Elizabeth is skeptical. Jane is accepting and Elizabeth is inquisitive. She boldly asks Wickham his disagreement with Darcy. Then, just as boldly, she asks Darcy the same question.
Elizabeth states her mind, even to her mother. Jane would never show disrespect.