 Williamson (2000) and Turri (2016) reject the certainty norm of assertion. Although a certainty version of Moore’s paradox does sound infelicitous, it doesn’t sound quite so bad as a knowledge version. Moreover, the oddity of the certainty version can be explained by the fact that there is generally “a reluctance to allow the contextually set standards for knowledge and certainty to diverge” (Williamson 2000, p. 254). That is, the standards for what counts as knowledge and as certainty typically match one another. Nevertheless, in some contexts we can pull them apart. When that happens, Williamson suggests that we assess assertions in accordance with the knowledge norm. Turri (2016) reports empirical results confirming that this is in fact the way ordinary speakers assess assertions.