Full Idea
In effect, the machinery introduced to solve the liar can always be rejigged to yield another version the liar.
Gist of Idea
The machinery used to solve the Liar can be rejigged to produce a new Liar
Source
William D. Hart (The Evolution of Logic [2010], 4)
Book Reference
Hart,W.D.: 'The Evolution of Logic' [CUP 2010], p.122
A Reaction
[He cites Hans Herzberger 1980-81] The machinery is Tarski's device of only talking about sentences of a language by using a 'metalanguage'.