Full Idea
The whole truth supervenes on the physical truth.
Clarification
'Supervenes' means 'is inseparable from'
Gist of Idea
The whole truth supervenes on the physical truth
Source
David Lewis (Lewis: reduction of mind (on himself) [1994], p.412)
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.412
A Reaction
This seems to me the central truth about brains, and we should not be lured into abandoning it. We should not, however, exclude the possibility that there is a non-physical reality.