Plato, Laws 705b

τραχεῖα δὲ οὖσα δῆλον ὡς οὐκ ἂν πολύφορός τε εἴη καὶ πάμφορος ἅμα· τοῦτο γὰρ ἔχουσα, πολλὴν ἐξαγωγὴν ἂν παρεχομένη, νομίσματος ἀργυροῦ καὶ χρυσοῦ πάλιν ἀντεμπίμπλαιτʼ ἄν, οὗ μεῖζον κακὸν ὡς ἔπος εἰπεῖν πόλει ἀνθʼ ἑνὸς ἓν οὐδὲν ἂν γίγνοιτο εἰς γενναίων καὶ δικαίων ἠθῶν κτῆσιν, ὡς ἔφαμεν, εἰ μεμνήμεθα, ἐν τοῖς πρόσθεν λόγοις. ἀλλὰ μεμνήμεθα, καὶ συγχωροῦμεν τότε λέγειν ἡμᾶς ὀρθῶς καὶ τὰ νῦν.

our State has compensation in the fact that it is all-productive; and since it is hilly, it cannot be highly productive as well as all-productive; if it were, and supplied many exports, it would be flooded in return with gold and silver money—the one condition of all, perhaps, that is most fatal, in a State, to the acquisition of noble and just habits of life,—as we said, if you remember, in our previous discourse. We remember, and we endorse what you said both then and now.