Full Idea
Instead of putting a judgement together out of an individual as subject and an already previously formed concept as predicate, we do the opposite and arrive at a concept by splitting up the content of possible judgement.
Gist of Idea
We don't judge by combining subject and concept; we get a concept by splitting up a judgement
Source
Gottlob Frege (Boole calculus and the Concept script [1881], p.17)
Book Reference
Frege,Gottlob: 'Posthumous Writings', ed/tr. Hermes/Long/White etc [Blackwell 1979], p.17
A Reaction
This is behind holistic views of sentences, and hence of whole languages, and behind Quine's rejection of 'properties' inferred from the predicates in judgements.