A cause is determined by certain persons, places, times, actions, and things, either all or most of them; but a proposition is declared in some one of those things, or in several of them, and those not the most important: therefore, a proposition is a part of a cause. But the whole inquiry is about some particular one of those things in which causes are contained; whether it be one, or many, or sometimes all. But of inquiries, concerning whatever thing they are, there two kinds; one theoretical, the other practical. Theoretical inquiries are those of which the proposed aim is science; as, 'If it is inquired whether right proceeds from nature, or from some covenant, as it were, and bargain between men. But the following are instances of practical inquiry: "Whether it is the part of a wise man to meddle with statesmanship." The inquiries into theoretical matters are threefold; as what is inquired is, whether a thing exists, or what it is, or what its character is. The first of these queries is explained by conjecture; the second, by definition; the third, by distinctions of right and wrong.
The method of conjecture is distributed into four parts; one of which is, when the inquiry is whether something exists; a second, when the question is, whence it has originated; a third, when one seeks to know what cause produced it; the fourth is that in which the alterations to which the subject is liable are examined: "Whether it exists or not; whether there is anything honourable, anything intrinsically and really just; or whether these things only exist in opinion." But the inquiry whence it has originated, is when an inquiry is such as this, "Whether virtue is implanted by nature, or whether it can be engendered by instruction." But the efficient cause is like this, as when an inquiry is, "By what means eloquence is produced." Concerning the alterations of anything, in this manner: "Whether eloquence can by any alteration be converted into a want of eloquence."
XXII. But when the question is what a thing is; the notion is to be explained, and the property, and the division, and the partition. For these things are all attributed to definition. Description also is added, which the Greeks call [Greek: charaktaer]. A notion is inquired into in this way: "Whether that is just which is useful to that person who is the more powerful." Property, in this way: "Whether melancholy is incidental to man alone, or whether beasts also are liable to it." Division, and also partition, in this manner: "Whether there are three descriptions of good things." Description, like this: "What sort of person a miser is; what sort of person a flatterer;" and other things of that sort, by which the nature and life of a man are described.
But when the inquiry is what the character of something is, the inquiry is conducted either simply, or by way of comparison. Simply, in this way: "Whether glory is to be sought for." By way of comparison, in this way: "Whether glory is to be preferred to riches." Of simple inquiries there are three kinds; about seeking for or avoiding anything, about the right and the wrong; about what is honourable and what is discreditable. But of inquiries by way of comparison there are two; one of the thing itself and something else; one of something greater and something else. Of seeking for and avoiding a thing, in this way: "Whether riches are to be sought for: whether poverty is to be avoided." Concerning right and wrong: "Whether it is right to revenge oneself, whoever the person may be from whom one has received an injury." Concerning what is honourable and what is discreditable: "Whether it is honourable to die for one's country." But of the other kind of inquiry, which has been stated to be twofold, one is about the thing in question and something else; as if it were asked, "What is the difference between a friend and a flatterer, between a king and a tyrant?" The other is between something greater and something less; as if it were asked, "Whether eloquence is of more consequence than the knowledge of civil law." And this is enough about theoretical inquiries.
It remains to speak of practical ones; of which there are two kinds: one relating to one's duty, the other to engendering, or calming, or utterly removing any affection of the mind. Relating to duty thus: as when the question is, "Whether children ought to be bad." Relating to influencing the mind, when exhortations are delivered to men to defend the republic, or when they are encouraged to seek glory and praise: of which kind of addresses are complaints, and encouragements, and tearful commiseration; and again, speeches extinguishing anger, or at other times removing fear, or repressing the exultation of joy, or effacing melancholy. As these different divisions belong to general inquiries, they are also transferable to causes.
XXIII. But the next thing to be inquired is, what topics are adapted to each kind of inquiry; for all those which we have already mentioned are suitable to most kinds; but still, different topics, as I have said before, are better suited to different investigations. Those arguments are the most suitable to conjectural discussion which can be deduced from causes, from effects, or from dependent circumstances. But when we have need of definition, then we must have recourse to the principles and science of defining. And akin to this is that other argument also which we said was employed with respect to the subject in question and something else; and that is a species of definition. For if the question is, "Whether pertinacity and perseverance are the same thing," it must be decided by definitions. And the topics which are incidental to a discussion of this kind are those drawn from consequents, or antecedents, or inconsistencies, with the addition also of those two topics which are deduced from causes and effects. For if such and such a thing is a consequence of this, but not a consequence of that; or if such and such a thing is a necessary antecedent to this, but not to that; or if it is inconsistent with this, but not with that; or if one thing is the cause of this, and another the cause of that; or if this is effected by one thing, and that by another thing; from any one of these topics it may be discovered whether the thing which is the subject of discussion is the same thing or something else.
With respect to the third kind of inquiry, in which the question is what the character of the matter in question is, those things are incidental to the comparison which were enumerated just now under the topic of comparison. But in that kind of inquiry where the question is about what is to be sought for or avoided, those arguments are employed which refer to advantages or disadvantages, whether affecting the mind or body, or being external. And again, when the inquiry is not what is honourable or discreditable, all our argument must be addressed to the good or bad qualities of the mind.
But when right and wrong are being discussed, all the topics of equity are collected. These are divided in a two-fold manner, as to whether they are such by nature or owing to institutions. Nature has two parts to perform, to defend itself, and to indicate right. But the agreements which establish equity are of a threefold character: one part is that which rests on laws; one depends on convenience; the third is founded on and established by antiquity of custom. And again, equity itself is said to be of a threefold nature: one division of it having reference to the gods above; another, to the shades below; a third, to mankind. The first is called piety; the second, sanctity; the third, justice or equity.
XXIV. I have said enough about propositions. There are now a few things which require to be said about causes. For they have many things in common with propositions.
There are then three kinds of causes; having for their respective objects, judgment, deliberation, and panegyric. And the object of each points out what topics we ought to employ in each. For the object of judicial judgment is right; from which also it derives its name. And the divisions of right were explained when we explained the divisions of equity. The object of deliberation is utility; of which the divisions have also been already explained when we were treating of things to be desired. The object of panegyric is honour; concerning which also we have already spoken.