Therefore, while we were explaining the proper classification of this art, and its duties, and its object, and its subject matter, and its divisions, the first book contained an account of the different kinds of disputes, and inventions, and statements of cases, and decisions. After that, the parts of a speech were described, and all necessary precepts for all of them were laid down. So that we not only discussed other topics in that book with tolerable distinctness, we spoke at that same time in a more scattered manner of the topics of confirmation and reprehension; and at present we think it best to give certain topics for confirming and reprehending, suited to every class of causes. And because it has been explained with some diligence in the former book, in what manner argumentations ought to be handled, in this book it will be sufficient to set forth the arguments which have been discovered for each kind of subject simply, and without any embellishment, so that, in this book, the arguments themselves may be found, and in the former, the proper method of polishing them. So that the reader must refer the precepts which are now laid down, to the topics of confirmation and reprehension. IV. Every discussion, whether demonstrative, or deliberative, or judicial, must be conversant with some kind or other of statement of the case which has been explained in the former book; sometimes with one, sometimes with several. And though this is the case, still as some things can be laid down in a general way respecting everything, there are also other rules and different methods separately laid down for each particular kind of discussion. For praise, or blame, or the statement of an opinion, or accusation, or denial, ought all to effect different ends. In judicial investigations the object of inquiry is, what is just, in demonstrative discussion the question is what is honourable, in deliberations, in our opinion, what we inquire is, what is honourable and at the same time expedient. For the other writers on this subject have thought it right to limit the consideration of expediency to speeches directed to persuasion or dissuasion. Those kinds of discussions then whose objects and results are different, cannot be governed by the same precepts. Not that we are saying now that the same statement of the case is not admissible in all of them, but some kinds of speech arise from the object and kind of the discussion, if it refers to the demonstration of some kind of life, or to the delivery of some opinion. Wherefore now, in explaining controversies, we shall have to deal with causes and precepts of a judicial kind, from which many precepts also which concern similar disputes will be transferred to other kinds of causes without much difficulty. But hereafter we will speak separately of each kind.