Full Idea
Since metaphysics doesn't want to assert analytic propositions, nor fall within the domain of physical science, it is compelled to employ words for which no criteria of application are specified, ..or else combine meaningful words..into pseudo-statements.
Gist of Idea
Metaphysics uses empty words, or just produces pseudo-statements
Source
Rudolph Carnap (Elimination of Metaphysics by Analysis of Language [1959]), quoted by Tim Maudlin - The Metaphysics within Physics 2.4
Book Reference
Maudlin,Tim: 'The Metaphysics within Physics' [OUP 2007], p.69
A Reaction
A classic summary of the logical positivist rejection of metaphysics. I incline to treat metaphysics as within the domain of science, but at a level of generality so high that practising scientists become bewildered and give up.