The Ubiquity of Self‐Deception

My paper is a discussion of Bas van Fraassen’s important, but neglected, paper on self‐deception, “The Peculiar Effects of Love and Desire.” Paradoxes of self‐deception are widely thought to follow from the ease with which we know ourselves. For example, if self‐deception were intentional, how could we fail to know as target of our own deception just those things necessary to undermine the deception? Van Fraassen stands that reasoning on its head, arguing that is the ease with which we accuse ourselves of self‐deception that undermines our confidence in our claims to know ourselves. I unpack and modify his argument, attempting to show that it makes a powerful case for scepticism about self‐knowledge. I argue, contra van Fraassen, that local scepticism about self‐knowledge threatens our claims to know ourselves in a way that global scepticism does not threaten our claims about the external world. I support this claim by showing that the Wittgensteinian response to the sceptic in On Certainty —that we don’t know what to do with the sceptic’s doubts, that we don’t know how to incorporate those doubts into our practices—does not succeed in deflecting scepticism about self‐knowledge because the local sceptic’s doubts—about whether we can distinguish genuine claims to know ourselves from self‐deceived claims—are integral to language game of self‐knowledge. The local sceptic’s doubts are our doubts because it is natural to ask whether we are deceiving ourselves when we claim to know ourselves. However, because, we have no way of distinguishing genuine claims to know ourselves from self‐deceived claims, our claims to self‐knowledge are systematically undermined.