 That said, everything that is real might also exist. The first portion of McTaggart’s the Nature of Existence is devoted to showing that either reality and existence are in fact coextensive, or, failing this, that can learn everything important about what is real by studying what exists. As part of the project of showing this, McTaggart argues against the reality of some putative entities that might be taken to be real but non-existent. For example, McTaggart argues that there is no reason to believe propositions (construed as abstract objects). According to McTaggart, truth is a relation not between a proposition and a fact but rather between a belief and a fact, whereas falsity is a relation between a belief and all the facts: to be false is to fail to correspond with any fact. Moreover, on McTaggart’s view, there are no non-existent facts.