This article aims firstly to put up the discursive modalities and speech acts that have a pragmatic value in the text of “The inaugural lesson” by Keba Mbaye. Secondly, it will be a question of analyzing and interpreting the pragmatic value of these speech acts that make successful the communication in terms of persuasion. Thus we will precise the environmental framework of the study. We will inventory and decipher the discursive function of these particular constituent elements of the speech and finally we will put in relation these discursive elements that make persuasive the arguments. The pragmatic approach of communication proposes techniques for the interpretation about what is explicitly or implicitly said and also about the presupposition, will help finding out and analyzing some speech acts from the organizational point of view of the speech. The first part deals with the problematics and offers a presentation of the framework. As for the second part, it focuses on the different discursive mechanisms pointed up by the speaker to accomplish his purpose which is at the same time convincing and persuading the hearers.