This work aims to understand the value of the use of language in the Comentarios reales by Inca Garcilaso de la Vega. For this purpose, two scenes in the text are analyzed. Firstly, I seek to read the story of Pedro Serrano in the Comentarios reales as «poetic truth». This will allow me to hold that this story considers language as a way of understanding the other and as a tool for establishing relationships between subjects and developing identities. Secondly, I enumerate the functions that the general language fulfilled during the government of the Incas and how it provided social cohesion despite the cultural differences of the peoples conquered by the Inca empire. Both aspects have an impact on Inca Garcilaso's language awareness that transcends linguistic corrections and focuses on individual and collective identity.