The British writer and apologist C. S.
Lewis was fully aware of the fact that the reflection on language does not only belong to academic sphere, but it opens the questions which have to be answered by any speaker. The theory of language cannot be separated from the practical aspect of human existence.
Because of this reason , Lewis responds to the challenge to grasp the theme of language theoretically while applying its results in practice. The aim of the article is to sketch Lewis' theory of language and to show its practical consequences, which can be inspiring for contemporary (not only) Christian authors.