 With these assumptions in the background, here is a non-linguistic argument for intellectualism. Start from (Knowledge-how/Intentionality): if S intentionally Φs, S knows how to Φ. Furthermore, suppose that (Intentionality/Knowledge) is true so that the intentionality of an action is to be explained at least in part in terms of propositional knowledge. Then, by these two premises, we get that if one intentionally Φs, one both knows how to Φ and one has propositional knowledge of the means to Φ: