Sermons fulfill the criteria of public speaking and they are often defined as a rhetoric genre. Homiletics is therefore obliged to acknowledge the importance of speech preparation and speech performance. This paper represents firstly theoretical background including elementary concepts such as: sermon, rhetorics, rhetorical structure, speech performance and the results of previous researches on this subject. The analysis observed elements of rhetorical design: introduction, conclusion, figurativeness and argumentation and parameters of speech performance which the most achieve speech expressiveness: pauses, logical emphasis, non-reading, voice and diction in order to determine the rhetorical design of analyzed sermons and whether preachers are expressive and oratory elegant and which parameters make it possible for them to achieve it. The results have shown that most sermons have all parts of rhetorical design, although rhetorically more or less successful, and that most preachers should work on their speech performance. Therefore, at the end of the paper, the preparation of a class-lesson aimed at raising awareness of the importance of oratory school and preparing a sermon, respecting the laws of rhetorical design. It was also planned to practice speech performance with participants that would enable them to achieve a more natural and expressive public performance in preaching.