《简·爱》第21章中的一些好句赏析如下：
1. "I have an ancient and melancholy heart filled with past troubles."（我有一颗古老而忧郁的心，充满了过去的烦恼。）
2. "I have not been in the habit of considering myself as anything very remarkable, and it is possible that in my look there may be a degree of pride； but if there is, it is hidden deep down, and only comes to the surface in the presence of the few I love."（我并不习惯认为自己有什么特别了不起的地方，我的外表可能带有一点傲慢；但如果有的话，那也是深藏不露的，只有在我所爱的人面前才会显露出来。）
3. "I have a strong and independent spirit, and now I feel that I have not only the means to support myself, but also the will not to be a burden to others."（我有一颗坚强独立的精神，现在我感到我不仅有自立的能力，而且还有不成为他人负担的意愿。）
这些句子体现了简·爱内心的坚强与独立，以及她对自己价值和尊严的坚持。简·爱是一个充满力量和智慧的女性角色，她的这些话语也反映了她的性格特点和她在人生中所坚持的原则