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Tractatus Logico-Philosophicus by Ludwig Wittgenstein + comments  by Maarten Maartensz   

 

3.1 In a proposition a thought finds an expression that can be perceived by the senses.

Either this is trivial ("sentences express thoughts") or false ("thoughts can be perceived when expressed as sentences"). W. probably meant the latter. This is false or at least quite misleadingly expressed as one sees from any sentence in a language one doesn't know.