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Full Idea
The 'vicious-circle principle' says 'whatever involves an apparent variable must not be among the possible values of that variable', or (less exactly) 'whatever involves ALL must not be one of ALL which it involves.
Gist of Idea
Vicious Circle: what involves ALL must not be one of those ALL
Source
Bertrand Russell (On 'Insolubilia' and their solution [1906], p.204)
Book Ref
Russell,Bertrand: 'Essays in Analysis', ed/tr. Lackey,Douglas [George Braziller 1973], p.204
A Reaction
He offers this as a parallel to his 'no classes' principle. That referred to classes, but this refers to propositions, and specifically the Liar Paradox (which he calls the 'Epimenedes').