An addendum to the previous post.
Try out the common definition of joy as non-emotional action on your wife:
“Honey, I rejoice in you by taking out the trash and mowing the lawn, despite what you are actually like! My joy in our marriage exists independent of any qualities inherent in you; I give my joy freely as a gift to one who is not worthy of it! And my joy is not an emotion, so you can count on its constancy! Honey…? Honey!? Where are you going!!”