What is the theme in Agnes Grey by Anne Bronte?

One of the main character themes is perseverance. She uses this perseverance to try to influence the Bloomfield children but feels that she has little effect on them. This is not the first time that Agnes has shown perseverance in this novel. She first perseveres in her desire to be a governess and help her family. Although her family does not want her to have to get a job, she is finally able to convince them that she is capable of being a teacher.