Full Idea
The propositions of logic are tautologies. Therefore the propositions of logic say nothing. (They are the analytic propositions).
Gist of Idea
The propositions of logic are analytic tautologies
Source
Ludwig Wittgenstein (Tractatus Logico-Philosophicus [1921], 6.1)
Book Reference
Wittgenstein,Ludwig: 'Tractatus Logico-Philosophicus (Pears)', ed/tr. Pears,D. /McGuinness,B. [RKP 1961], p.59