As readers, we remain in the nursery stage so long as we cannot distinguish between taste and judgment, so long, that is, as the only possible verdicts we can pass on a book are two: this I like; this I don't like.
For an adult reader, the possible verdicts are five: I can see this is good and I like it; I can see this is good but I don't like it; I can see this is good and, though at present I don't like it, I believe that with perseverance I shall come to like it; I can see that this is trash but I like it; I can see that this is trash and I don't like it.