In this discussion, Slomšek’s thought of unity expressed in his sermon Od keršanske zloge ino edinosti u veri, is being brought to your attention, as well as his endeavours for unity are introduced. Slomšek pursued unity, especially in the following three fields: (1) unifying the Slovenian language (Slovenian literary standard), (2) the unity of the Slovenian nation (he was a great national awakener), and (3) an ecclesiastic unity (he was a renowned teacher of ecumenism). In Slomšek’s case, the three viewpoints are interconnected, since he had a fixed plan of how to carry them out. In the middle of the 19th century, his views had been well abreast of the times and in the spirit of the ideas which were later acted out in „the Spring of Nations,” and are also interesting and up-to-date with regard to the questions connected to Slovenian language, nation, and Church. By the intervention of these principles, the word delivered among the Slovenian nation by means of different files, books, codices, publishing, and above all through sermons, had a specific role. In the second part, through the use of a linguistic and stylistic analysis, it is presented that his sermon is being written in a cultivated literary language of artistic variety according to the field of discourse, and in a specific linguistic and stylistic manner calls for the unification. According to that, the most obvious linguistic and stylistic means in Slomšek’s sermons are highlighted, proving the great power of expression of his word.