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Full Idea
We need rules for deciding what norms are predicative and what are not, unless we adopt the view (which has much to recommend it) that no norms are predicative. ...[146] A predative propositional function is one which determines a class.
Gist of Idea
We need rules for deciding which norms are predicative (unless none of them are)
Source
Bertrand Russell (Difficulties of Transfinite Numbers and Types [1905], p.141)
Book Ref
Russell,Bertrand: 'Essays in Analysis', ed/tr. Lackey,Douglas [George Braziller 1973], p.141
A Reaction
He is referring to his 'no class' theory, which he favoured at that time.
Related Idea
Idea 21558 'Predicative' norms are those which define a class [Russell]