In chapter 1 of portrait, when he’s about seven or eight years old i think, there’s a famous scene where Dedalus is caned at school in front of all his classmates (my mother went to catholic school in the 50’s; when she read that part in portrait she cried). Those are the words that that prefect used: “I see it in your face, lazy idle little schemer.” At 22 in Ulysses the simple phrase “I see it in your face” is enough to bring Dedalus back to that.
I get that this is probably a weird way to say ‘yeah you should totally read Dubliners and Portrait first cuz you get stuff like this out of Ulysses’.
Otoh for Joyce it’s not just the phrase, it’s the context: Dedalus is being encouraged here, but encouraged in order to put him to rightwing nationalist work by two old bigots who are his bosses—something that he finds similar, and humiliating.