Full Idea
To accept the thing world means nothing more than to accept a certain form of language, in other words, to accept rules for forming statements and for testing, accepting, or rejecting them.
Gist of Idea
We only accept 'things' within a language with formation, testing and acceptance rules
Source
Rudolph Carnap (Empiricism, Semantics and Ontology [1950], 2)
Book Reference
Carnap,Rudolph: 'Meaning and Necessity (2nd ed)' [Chicago 1988], p.208
A Reaction
If you derive your metaphysics from your language, then objects are linguistic conventions. But why do we accept conventions about objects?