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58. ἀπὸ ἐπιστήμηςτὴν δύναμιν κτλ. Protagoras says in effect: δύναμις and ἰσχύς are of the body, θάρσος and ἀνδρεία of the soul. δύναμις may come from knowledge (as when one has learnt how to wrestle: above 350E, or from madness or rage (as in the feats of madmen, or men inspired with the thirst for vengeance; such men have no real physical strength or ἰσχύς as it is presently defined, but excel themselves by virtue of δύναμις). ἰσχύς comes from natural constitution (φύσις) and proper nurture of the body (by gymnastics in the widest sense). Similarly θάρσος may result from art (τέχνη is substituted for ἐπιστήμη in view of the illustrations in 350A, from rage or madness (as when Empedocles leapt into Etna); ἀνδρεία comes from the native character and proper nurture of the soul (cf. Rep. III. 410D τὸ θυμοειδὲςτῆς φύσεωςὀρθῶς μὲν τραφὲν ἀνδπεῖον ἂν εἴη, μᾶλλον δ᾽ ἐπιταθὲν τοῦ δέοντος σκληπόν τε καὶ χαλερὸν γίγνοιτ᾽ ἄν, ὡς τὸ εἰκός).

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