Umberto Eco book Semiotics and the Philosophy of Language
[I] Signs, 1.13 : Sign and subject
Semiotics and the Philosophy of Language (1984)
Context: !-- The subject is constantly reshaped by the endless resegmentation of the content. In this way (even though the process of resegmentation must be activated by someone, who is probably the collectivity of subjects), the subject is spoken by language (verbal and nonverbal), by the dynamic of sign-functions rather than by the chain of signifiers. --> As subjects, we are what the shape of the world produced by signs makes us become.
Perhaps we are, somewhere, the deep impulse which generates semiosis. And yet we recognize ourselves only as semiosis in progress, signifying systems and communicational processes. The map of semiosis, as defined at a given stage of historical development (with the debris carried over from previous semiosis), tells us who we are and what (or how) we think.