 However we understand the ontological status of moral properties in Hutcheson’s sentimentalism, it is clear that Hutcheson made it his business to insist that the foundation of morality is not to be found in our rational capacities, or capacities for the determination of truth and reason (see Gill 2006: ch. 12). This put Hutcheson at odds with his rationalist contemporaries, most importantly John Balguy, Samuel Clarke, and William Wollaston. In the Illustrations on the Moral Sense (which was published with the Essay), Hutcheson offers a sustained critique of these authors and other forms of rationalism (cf. Essay, 137–155).