Saussure

"In a language there are only differences without positive terms. Whether we take the signified or the signifier, the language contains neither ideas nor sounds that pre-exist the linguistic system, but only conceptual differences and phonic differences issuing from this system." (From the posthumous Course in General Linguistics, 1916.) No one becomes as famous as Saussure without both admirers and detractors reducing them to a paragraph's worth of ideas that can be readily quoted, debated...