 Following Rea (2003) we divide relative identity trinitarian theories into the pure and the impure. Pure theories accept (1) either that there is no such relation as absolute identity or that such statements are definable in terms of relative-identity relations, and (2) that trinitarian statements of sameness and difference (e.g. the Father is God, the Father is not the Son) are to be analyzed as involving relative and not absolute identity relations, whereas the impure theories accept only (2), allowing that statements about absolute identity (e.g. a = b) may be both intelligible and true, against (1). (434–8)