The intellectual is, quite simply, a human being who has a pencil in his or her hand when reading a book.

I’ve been doing a lot more of this lately because I finally jettisoned my inhibition about writing in books. I had already been buying used/reading copies for years. Now it’s time to cash in!

Found via Austin Kleon’s great newsletter. The rest of Austin’s comment on this one is great too, check it out.