The main purpose of this article is to show how the language is conceived in the encyclical Fides et ratio, especially taking into account its relationship with truth. It is also attempted to present an analitical study of the text concerning language: the different references to it and the consideration of the modern sciences of language; how truth is linked to language and signification, and how human language though linguistic communication can surely renew and enhance the rational expressin of Christian (...) faith. (shrink)