Full Idea
I hold that logic is what is fundamental in philosophy, and that schools should be characterised rather by their logic than by their metaphysics.
Gist of Idea
It is logic, not metaphysics, that is fundamental to philosophy
Source
Bertrand Russell (Logical Atomism [1924], p.143)
Book Reference
Russell,Bertrand: 'Russell's Logical Atomism', ed/tr. Pears,David [Fontana 1972], p.143
A Reaction
Personally I disagree. Russell seems to have been most interested in the logical form underlying language, but that seems to be because he was interested in the ontological implications of what we say, which is metaphysics.