What is the theme in That Hideous Strength by C. S. Lewis?

Another theme is pride versus humility. During the beginning of the novel, the reader observes both of the main characters, Jane and Mark, exhibiting different kinds of pride. Jane is prideful in her feelings toward Mark within the marriage. She does not want to be "owned" in any way, and she will, therefore, not submit to him under any circumstances. As a result of her pride, Jane begins to feel no compassion for Mark. At the same time, Mark is proud of his accomplishments in gaining entrance into the Fellows at Bracton, as well as the Progressive Element within the Fellowship. Because his goals lie with these things, he pays little attention to his relationship with Jane. Therefore, the pride of both Jane and Mark contribute to the deterioration of their marriage.