Book 3
18.7
As for jests, since they may sometimes be useful in debates, the advice of Gorgias was good—to confound the opponents' earnest with jest and their jest with earnest. We have stated in the PoeticsThe chapters are lost (cp. 1.11.29). how many kinds of jests there are, some of them becoming a gentleman, others not. You should therefore choose the kind that suits you. Irony is more gentlemanly than buffoonery; for the first is employed on one's own account, the second on that of another.
19.1
The epilogue is composed of four parts: to dispose the hearer favorably towards oneself and unfavorably towards the adversary; to amplify and depreciate; to excite the emotions of the hearer; to recapitulate. For after you have proved that you are truthful and that the adversary is false, the natural order of things is to praise ourselves, blame him, and put the finishing touches.Or, mould the hearers to one's will (L. and S.). One of two things should be aimed at, to show that you are either relatively or absolutely good and the adversary either relatively or absolutely bad. The topics which serve to represent men as good or bad have already been stated.Book 1.9.