Freud: bookworm

[W]hen I became a student, I had developed a passion for collecting and owning books, which was analogous to my liking for learning out of monographs: a favourite hobby. . . I had become a bookworm. I had always, from the time I first began to think about myself, referred this first passion of mine back to the childhood memory I have mentioned. Or rather, I had recognized that the childhood memory was a 'screen memory' for my later bibliophile propensities. And I had already discovered, of course, that passion often leads to sorrow. When I was seventeen I had run up a largish account at the bookseller's and had nothing to meet it with; and my father had scarcely taken it as an excuse that my inclinations might have taken a worse outlet.
(Freud, 1900, pb. 205)