Full Idea
A proposition is understood by anyone who understands its constituents.
Gist of Idea
Propositions are understood via their constituents
Source
Ludwig Wittgenstein (Tractatus Logico-Philosophicus [1921], 4.024)
Book Reference
Wittgenstein,Ludwig: 'Tractatus Logico-Philosophicus (Pears)', ed/tr. Pears,D. /McGuinness,B. [RKP 1961], p.21
A Reaction
The 'constituents' had better include the grammatical relationships. Otherwise it's 'rearrange these words to make a well known saying'. That said, this strikes me as an important truth about language. We assemble sentence meanings.