Institutio Oratoria

But one alleged motive may also in my opinion involve several questions and several points for the decision of the judge, as for instance in the case when the husband caught his wife in adultery and slew her and later slew the adulterer, who had escaped, in the market place. The motive is but one:

he was an adulterer.

But just as, although there be several questions, each with its special basis, the basis of the case is but one, namely that to which all else is referred, even so the real point for the decision of the judge is, strictly speaking, that on which judgment is given.

As for the σύνεχον the central argument, as I have mentioned it is called by some, or the foundation as it is called by others, or as Cicero [*](De Inv. I. xiv. 19. ) styles it the strongest argument of the defender and the most relevant to the decision of the judge, some regard it as being the point after which all enquiry ceases, others as the main point for adjudication.

The motive of the deed does not arise in all controversial cases. For how can there be a motive for the deed, when the deed is denied? But when the motive for the deed does come up for discussion, they deny that the point for the decision of the judge rests on the same ground as the main question at issue, and this view is maintained by Cicero [*](De Inv. I. c.: Part. Or. xxx. 104. ) in his Rhetorica and Partitiones.

For when it has been asserted and denied that a deed was done, the question whether it was done is resolved by conjecture, and the decision of the judge and the main question rest on the same ground, since the first question and the final decision are concerned with the same point. But when it is stated and denied that Orestes was justified in killing his mother, considerations of quality are introduced: the question is whether he was justified in killing her, but this is not yet the point for the decision of the judge. When, then, does it become so?

She killed my father.

Yes, but that did not make it your duty to murder your mother.