Full Idea
There is surely no metaphysical basis for logic, but equally there is no logical basis for metaphysics, if that implies that we can settle the choice of logic in advance of settling any seriously contested metaphysical-cum-semantic issues.
Gist of Idea
Logic doesn't have a metaphysical basis, but nor can logic give rise to the metaphysics
Source
Ian Rumfitt (The Boundary Stones of Thought [2015], 7.5)
Book Reference
Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.219
A Reaction
Is this aimed at Tim Williamson's book on treating modal logic as metaphysics? I agree with the general idea that logic won't deliver a metaphysics. I might want to defend a good metaphysics giving rise to a good logic.