Full Idea
We do sometimes say of something to which we have referred that it is true (or false). Are we not ordinarily doing just this when we utter such sentences as 'That's true' and 'What he said was false'?
Gist of Idea
We can attribute 'true' and 'false' to whatever it was that was said
Source
Richard Cartwright (Propositions [1962], 03)
Book Reference
Cartwright,Richard: 'Philosophical Essays' [MIT 1987], p.34
A Reaction
This supports propositions, but doesn't clinch the matter. One could interpret this phenomenon as always being (implicitly) the reference of one sentence to another. However, I remember what he said, but I can't remember how he said it.