If you've read shelves of thick books, people might describe you as a person of erudition. You might find erudition to be its own reward, but if you can make a career of it, even better!
The Latin root of erudition is the verb erudire which means "to teach or train." By showing erudition, you show that you've learned a lot. If you write with erudition, your readers will know that you are a serious scholar, as long as you're not too far over their heads.