Ordinary language is all right.
One could divide humanity into two classes:
those who master a metaphor, and those who hold by a formula.
Those with a bent for both are too few, they do not comprise a class.
'What familiar occupieng & enterteynement there is emong ye people.'
Νέος ἐφ' ἡμέρῃ ἥλιος.
'I think it is sometimes felt that drawing an analogy between moral conduct and games makes moral conduct seem misleadingly simple (or trivial?), because there are no rules in moral conduct corresponding to the rules about how the Queen moves in chess. But this misses the point of the analogy, which is that moves and actions have to be done correctly; not just any movement you make will be a move, or a promise, a payment, a request. This does not mean that promising is (just) following rules. Yet if someone is tempted not to fulfill a promise, you may say "Promises are kept," or "We keep our promises (that is the sort of thing a promise is)," thus employing a rule-description—what I have called a categorical declarative. You may say "You must keep this promise" (you are underestimating its importance; last time you forgot). This is not the same as "You ought to keep this promise," which is only sensible where you have a reason for breaking it strong enough to allow you to do so without blame (there is a real alternative), but where you are enjoined to make a special effort or sacrifice. (This is partly why "You ought to keep promises" is so queer. It suggests that we not only always want badly to get out of fulfilling promises, but that we always have some good (anyway, prima facie) reason for not keeping them (perhaps our own severe discomfort) and that therefore we are acting well when we do fulfill. But we aren't, normally; neither well nor ill.) "Ought" is like "must" in requiring a background of action or position into which the action in question is set; and, like "must," it does not form a command, a pure imperative. All of which shows the hopelessness of speaking, in a general way, about the "normativeness" of expressions. The Britannica "rules" tell us what we must do in playing chess, not what we ought to do if we want to play. You (must) mean (imply), in speaking English, that something about an action is fishy when you say "The action is voluntary"; you (must) mean, when you ask a person "Ought you to do that?" that there is some specific way in which what he is doing might be done more tactfully, carefully, etc.… Are these imperatives? Are they categorical or hypothetical? Have you in no way contradicted yourself if you flout them? (Cf. n. 25.)
That "modal imperatives" ("must," "supposed to," "are to," "have to" …) require the recognition of a background action or position into which the relevant action is placed indicates a portentous difference between these forms of expression and pure imperatives, commands. Whether I can command depends only upon whether I have power or authority, and the only characteristics I must recognize in the object of the command are those which tell me that the object is subject to my power or authority. Employing a modal "imperative," however, requires that I recognize the object as a person (someone doing something or in a certain position) to whose reasonableness (reason) I appeal in using the second person. (Compare "Open, Sesame!" with "You must open, Sesame.") This is one reason that commands, pure imperatives, are not paradigms of moral utterance, but represent an alternative to such utterance.'
'We are still on the other side of the mirror. Yesterday you saw your best friend and told him of your passionate hatred of war. Now try to tell yourself that story in the style of Dos Passos. "And they ordered two beers and said that war was appalling. Paul stated he'd rather do anything than fight and John said he concurred and both were moved and said they were happy to agree. As he was going home, Paul decided to see more of John." You will immediately hate yourself. But it won't take you long to see that you can't speak of yourself in this tone. However insincere you might have been, at least you lived out your insincerity; you played it out on your own, you extended its existence at every moment in a process of continued creation. And even if you let yourself be dragged down into collective representations, you had first to live these out as an individual abdication. We are neither mechanisms nor possessed souls, but something worse: we are free. Entirely outside or entirely inside. Dos Passos's human is a hybrid, internal-external creature. We are with him and in him. We live with his vacillating individual consciousness and, suddenly, it falters, weakens, and flows off into the collective consciousness. We follow him and suddenly, here we are, outside, without having noticed it. This is the creature beyond the looking glass—strange, contemptible, and fascinating.'