According to expressivist views in ethics and aesthetics, sentences like "Murder is wrong" or "The Mona Lisa is beautiful" do not express a proposition, but express some kind of an attitude. I think many propositional attitudes are problematic for expressivists. Here is one that is perhaps not: "Sally thinks murder is wrong." This, the expressivist can say, is a sentence expressing the proposition that Sally has the attitude A, where A is the attitude that she would express by saying "Murder is wrong." But some are much harder:
- Sam knows that cheating on exams is wrong.
- Alex is unsure whether Picasso's cubist paintings are any good.
- The younger Augustine feared that fornication might be wrong.
- Dr. Jones hopes that her proposed experiment is morally acceptable.
- Mark hopes that the sculpture that he is working on will be beautiful.