Note 57 — Chapter VIII · PLATONIC COMPOSITIONS GENERALLY.
Reading edition
The Stoics had full conviction of this. In Cicero’s summary of the Stoic doctrine (De Finibus, iii. 21, 72) we read:—“Ad easque virtutes, de quibus disputatum est, Dialecticam etiam adjungunt (Stoici) et Physicam: easque ambas virtutum nomine appellant: alteram (sc. Dialecticam), quod habeat rationem, ne cui falso adsentiamur, neve unquam captiosâ probabilitate fallamur; eaque, quæ de bonis et malis didicerimus, ut tenere tuerique possimus.”