Plain Jane: “no one can think more highly of the understanding of women than I do. In my opinion, nature has given them so much, that they never find it necessary to use more than half.”
-Jane Austen in Northanger Abbey
A rather tongue-in-cheek compliment I think. I take it more as Jane’s attempt at a veiled motivational speech for the feminine sex: that is, that she saw so much that women could offer and few women who realized their potentiality themselves. I hope you use all of yourself today, whatever it is you are doing!