Full Idea
If you know the content of a thought, you thereby know what would make the thought true.
Gist of Idea
To know the content of a thought is to know what would make it true
Source
Jerry A. Fodor (The Elm and the Expert [1993], §4)
Book Reference
Fodor,Jerry A.: 'The Elm and the Expert' [MIT 1995], p.92
A Reaction
The truthmaker might by physically impossible, and careful thought might show it to be contradictory - but that wouldn't destroy the meaning.