Full Idea
If logic is to proceed mediately from conventions, logic is needed for inferring logic from the conventions. Conventions for adopting logical primitives can only be communicated by free use of those very idioms.
Gist of Idea
Logic isn't conventional, because logic is needed to infer logic from conventions
Source
Willard Quine (Truth by Convention [1935], p.104)
Book Reference
Quine,Willard: 'Ways of Paradox and other essays' [Harvard 1976], p.104
A Reaction
A common pattern of modern argument, which always seems to imply that nothing can ever get off the ground. I suspect that there are far more benign circles in the world of thought than most philosophers imagine.