Against the Professors, Books I-VI of Against the Learned Section 15

οὔτε τοῦ ὡς τὸ πολὺ ἐφιέμε- νον, ἐπεὶ πᾶς ῥήτωρ ἑαυτῷ συγκρινόμενος πολλάκις ἐλεί- φθη μᾶλλον ἢ ἐνίκησεν, ἅτε διὰ παντὸς ἑτέρου τὰς ἐπι- χειρήσεις αὐτοῦ διαλύοντος· οὐκ ἄρα τέχνη ἐστὶν ἡ ῥη- τορική.

Nor does it aim at an end attained for the most part, since every rhetorician, compared with himself, has often lost more often than he has won, because another person is continually undoing his arguments. Therefore rhetoric is not an art.

Elle ne vise pas non plus une fin atteinte le plus souvent, puisque tout rhéteur, comparé à lui-même, a souvent essuyé plus de défaites que de victoires, un adversaire déjouant chaque fois ses arguments. La rhétorique n’est donc pas un art.