A line from Jane Austen's Pride and Prejudice confuses me:
Mr. Bennet was so odd a mixture of quick parts, sarcastic humour, reserve, and caprice, that the experience of three and twenty years had been insufficient to make his wife understand his character. Her mind was less difficult to develop. She was a woman of mean understanding, little information, and uncertain temper.
I'm aware that Mrs Bennet is less intelligent than her husband (this line is talking about her) — however surely if her mind was less difficult to develop, then it would mean she was more intelligent. Surely the more difficult it is to develop a mind, the stupider a person is?
I feel as if I'm being stupid and missing something — but I really don't understand it.