What is the most important value in literature?

Is there any one thing that should be valued the most in literature? I know we talked about cognitive value in class, but is that the most important thing? Literature should help to cultivate the mind, it should help you to think creatively and critically, and see things from many different perspectives. It should convey truth and meaning, and you should learn something important from it. All of these things are very important, of course, but I can't help but think that there is something even more important than that. I believe the single most important value to take away from literature is catharsis. Catharsis can be a soul-cleansing experience, and provides much relief from repressed emotions. Catharsis can actually improve your health and mind, and it eases whatever burden you may carry. After catharsis, your mind and heart open up and are even more receptive to learning whatever more the literature has to teach you. All good things come after catharsis, what could be more important?