Full Idea
There is no knock down argument for the completeness of physics.
Gist of Idea
The completeness of physics cannot be proved
Source
David Papineau (Thinking about Consciousness [2002], App 7)
Book Reference
Papineau,David: 'Thinking about Consciousness' [OUP 2004], p.256
A Reaction
This is commendably honest, given that he pins his view of the mind on it. He makes the case sound overwhelming, though. The thing which would breach the completeness is like the Loch Ness monster - you can't prove it isn't there, if it hides.