Preaching is not mere instruction...
...the use of the Word does not consist in mere instruction, by which the hearer is only taught but...also...in warning, exhorting, and convicting. Indeed Christ commands His ministers not only to teach but to exhort, and Paul also declares that Scripture is useful not only for teaching, but also for exhortation (2Timothy 3:16).
Accordingly pastors are not to think that they have fulfilled their ministry when they have properly imbued their people with the right knowledge, unless they also devote themselves to this task... For we are far from being ready and active, as we ought to be, in doing our duty. For that reason our sloth needs goads, and our coldness needs to be warmed up.
- Calvin on Acts 14:21,22