Full Idea
Save, maybe, for purely formal (e.g. logical) theories, philosophical claims whose correctness does not depend, however indirectly, on matters of fact are empty: they are neither true nor false.
Gist of Idea
Philosophy is empty if it does not in some way depend on matters of fact
Source
Edouard Machery (Doing Without Concepts [2009], Intro)
Book Reference
Machery,Edouard: 'Doing Without Concepts' [OUP 2009], p.6
A Reaction
I subscribe to this view. I'd even say that logic is empty if it is not answerable to the facts. The facts are nature, so this is a naturalistic manifesto.
Related Idea
Idea 21360 Unobservant thinkers tend to dogmatise using insufficient facts [Aristotle]