 Hume clearly has Clarke in mind in his Dialogues Concerning Natural Religion, where Demea recites the argument a priori and both Cleanthes and Philo offer critiques. Furthermore, Clarke is cited by name in Treatise 1.3.3 and is a likely object of the arguments against ethical rationalism in Treatise 3.1. In A Letter from a Gentleman (1745), Hume admits that Clarke’s argument a priori is undermined by the claims of the Treatise. Russell (1997 and 2008) has proposed that Clarke is a major target of Hume’s Treatise, and that Hume’s opposition to natural theology as defended by Clarke is a uniting theme of the Treatise.