 One way of thinking about why the truth predicate is not well-behaved on the Liar sentence is that there is not really a well-defined truth bearer provided by the Liar sentence. To make this vivid (as discussed by C. Parsons (1974)), suppose that truth bearers are propositions expressed by sentences in contexts, and that the Liar sentence fails to express a proposition. This is the beginnings of an account of how the Liar winds up ungrounded or in some sense indeterminate. At least, we should not expect \(\Tr\) to be well-behaved where sentences fail to express propositions.