This paper hypothesizes that the paradox Hart confesses to in Ch. X of Essays on Bentham was the result of metaethical ambivalence. Hart eclectically yokes together metaethically incompatible elements from two disparate models of “normativity of law” with different sources of normativity: the impinging model based on a cognitivist metaethic and the projectivist model based on a noncognitivist metaethic. The “sources” of normativity in the two models are different. On the impinging model the source of normativity is a reason-giving objective moral requirement, and on the projectivist model, the source of normativity is a motivationally affective conative attitude. The metaethical configuration of the rule of recognition in Essays on Bentham constrained Hart to postulate a “source” of normativity metaethically congruous with the impinging model. However, the “source” of normativity Hart seemed keen to advance—he makes an “attitude” the source of normativity—was only congruous with the projectivist model.