In this article the first traces of Augustine’s desire to be not only a teacher but also, in conjunction with this, a writer of protreptics are pointed out in his Soliloquia and his De catechizandis rudibus. Protrepsis and first catechesis need to coincide. In De catechizandis rudibus, he advised deacon Deogratias to clarify the Last Judgement and the resurrection of the body. These two doctrines were both a pièce de resistance for pagans, and therefore also for rudes. The choice of these doctrines demonstrates Augustine’s attempt to have the deacon adopt a protreptic approach in his first catechesis – possibly without Deogratias even knowing it himself. There was no chance that the beginners would already be truly acquainted with these essential aspects of the Christian view of the world and of the future. As it turns out, the line between protrepsis and catechesis is a very fine one in this case.