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‘And if the one of two things that stand in a natural relation to one another (i. e. two relative terms; see above, §§ 8 and 10) be possible, then also the other; as double implies the possibility of half, and half of double’. Categ. c. 10, 11 b 26, διπλάσιον καὶ ἥμισυ is one of the stock examples of one kind or τὰ πρός τι, the category of relation. Of these relative opposites Cicero says, Top. XI 49, nam alia quoque sunt contrariorum genera, velut ea quae cum aliquo conferuntur: ut duplum, simplum; multa, pauca; longum, brevi; maius, minus. In de Invent. I 30. 47, the argument from these opposites is thus illustrated; In iis rebus quae sub eandem rationem cadunt hoc modo probabile consideratur: Nam si Rhodiis turpe non est portorium locare, ne Hermacreonti quidem turpe est conducere. To which Quintilian (referring to this place of Cicero, and quoting the example) adds—de suo apparently, for it is not in the original —Quod discere honestum, et docere [comp. Cicero, Orator, § 145]. Victorius. Ar. Rhet. 11 23. 3, ποιεῖν and πάσχειν τι κελεῦσαι and πεποιηκέναι. εἰ γὰρ μηδ᾽ ὑμῖν αἰσχρὸν τὸ πωλεῖν, οὐδ̓ ἡμῖν τὸ ὠνεῖσθαι.

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