No, I think he’s read all the books on all the languages, and he just keeps the ones he likes or finds useful out on the shelves. The rest are sealed away in nondescript boxes under the bed or in the wardrobe until a time comes when he needs them. Never to be discarded. (Yeah, I’ve known a few Professors. My Dad for instance had a prodigious collection of books on Chess. He read them all, then packed most them away.)