Plato, Laws 711d

ἀδύνατον οὐδὲ χαλεπῶς ἂν γενόμενον· ἀλλὰ τόδʼ ἐστὶ τὸ χαλεπὸν γενέσθαι, καὶ ὀλίγον δὴ τὸ γεγονὸς ἐν τῷ πολλῷ χρόνῳ, ὅταν δὲ συμβῇ, μυρία καὶ πάντʼ ἐν πόλει ἀγαθὰ ἀπεργάζεται, ἐν ᾗ ποτʼ ἂν ἐγγένηται. τὸ ποῖον δὴ λέγεις; ὅταν ἔρως θεῖος τῶν σωφρόνων τε καὶ δικαίων ἐπιτηδευμάτων ἐγγένηται μεγάλαις τισὶν δυναστείαις, ἢ κατὰ μοναρχίαν δυναστευούσαις ἢ κατὰ πλούτων ὑπεροχὰς διαφερούσαις

to bring about; what is difficult to bring about is rather that result which has taken place but rarely throughout long ages, and which, whenever it does take place in a State, produces in that State countless blessings of every kind. What result do you mean? Whenever a heaven-sent desire for temperate and just institutions arises in those who hold high positions,—whether as monarchs, or because of conspicuous eminence