The last chapter of Vygotsky's last book, "Thinking and Speech," is a compressed argument about the construction of consciousness through the internalisation of language. This article comments on Vygotsky's analysis of the "voyage into the interior" undertaken by oral speech as it is internalised and abbreviated into "inner speech," and then further concentrated as non-verbal thought. The article focuses on the part that literature and especially poetry play in Vygotsky's argument in this chapter, and suggests that in exploring the condensed semantics of inner speech Vygotsky is implicitly describing how poets turn private thoughts into "symbols for others." It concludes with a commentary on Vygotsky's use of Mandelshtam's poem "The Swallow," from which he draws his epigraph.