76 Truth
Aristotle distinguishes four sorts of opposites or counterparts. Contradictory
opposition, which holds (in principle) between an affirmation and a corres-
ponding negation has this special characteristic: if two items are contradictory
opposites, then (in an ancient jargon) they ‘divide truth and falsity’—at any
given time, exactly one of them is true and exactly one of them is false.
In his commentary Simplicius reports an objection which had been
advanced against that Aristotelian claim:
Here too Nicostratus finds fault, saying that it is not a property of contradictory
opposites to divide the true and the false; for it does not hold of them alone, nor of all
of them. Not of them alone since of jurative and abjurative sayings too it holds that
necessarily one of them is the case (e.g. ‘By God, I did it’, ‘By God, I didn’t do it’); and
the same holds for admiratives (‘How beautiful is the Piraeus’) and for reprehensives
(e.g. ‘He is wicked’, ‘He is not wicked’). Hence it does not hold of contradictories
alone. Nor yet of all of them, he says. For propositions with a future inflection are,
because of the nature of the contingent, neither true nor false—for neither ‘There
will be a sea-battle’ nor ‘There won’t be’ is true, but whichever happens to turn out.
(in Cat 406.6–16)⁶⁷
Simplicius then replies—or reports a reply—to Nicostratus. The reply
divides into two halves, one half devoted to each of the two criticisms made by
Nicostratus. Although only the second half is strictly pertinent to the present
business, I shall spend a moment on the first half, which addresses the claim
that ‘dividing truth and falsity’ is not peculiar to affirmation and negation.
The first part of the reply, ascribed to an anonymous ‘they’, begins by
remarking that in the Categories the division of truth and falsity is invoked
only to distinguish the opposition of affirmation and negation from the
other oppositions which Aristotle is there discussing, so that Nicostratus’
appeal to oaths and the like is irrelevant. That is correct. For Aristotle is not
there concerned to distinguish assertions from other types of saying but to
distinguish contradiction from other types of opposition: when he says ‘of
them alone’ he means ‘of contradictories alone among oppositions’.
⁶⁷ ὁ δὲ Νικόστρατος αἰτιᾶται κἀνταῦθα, λέγων μὴ ἴδιον εἶναι τῶν κατὰ ἀντίφασιν
ἀντικειμένων τὸ διαιρεῖν τὸ ἀληθὲς καὶ τὸ ψεῦδος. οὔτε γὰρ μόνοις οὔτε πᾶσιν αὐτοῖς
ὑπάρχει· οὐ μόνοις μέν, ὅτι καὶ τοῖς ὀμοτικοῖς καὶ τοῖς ἀπομοτικοῖς λόγοις ὑπάρχει τὸ ἐξ
ἀνάγκης θάτερον, οἷον νὴ τὴν ᾿Αθηνᾶν ἔπραξα τάδε· οὐ μὰ τὴν ᾿Αθηνᾶν οὐκ ἔπραξα. ἀλλὰ
καὶ τοῖς θαυμαστικοῖς, φησί, τὸ αὐτὸ ὑπάρχει· ὡς καλός γε ὁ Πειραιεύς· καὶ τοῖς ψεκτικοῖς,
οἷον φαῦλός ἐστιν, οὐ φαῦλός ἐστιν. οὐκ ἄρα μόνοις ὑπάρχει τοῖς κατὰ ἀντίφασιν τοῦτο. ἀλλ᾿
οὐδὲ πᾶσιν, φησίν. αἱ γὰρ εἰς τὸν μέλλοντα χρόνον ἐγκεκλιμέναι προτάσεις οὔτε ἀληθεῖς εἰσιν
οὔτε ψευδεῖς διὰ τὴν τοῦ ἐνδεχομένου φύσιν· οὔτε γὰρ τὸ ἔσται ναυμαχία ἀληθὲς οὔτε τὸ οὐκ
ἔσται, ἀλλ᾿ ὁπότερον ἔτυχεν.—It seems likely that a negative admirative has dropped from the
text.