In my previous posts, I wrote sentences like these:
Here is the sentence from C. S. Lewis' The Magician's Nephew.
Here is the piece from a video game.
Then I quoted one or more sentences from the book or game.
I don't really know if the definite article was correct there. Those sentences aren't the only ones present in the book or game, but, on the other hand, they're particular — they're the sentences I was going to talk about.