Plato, Laws 783a

δὲ ἡμῖν καὶ μεγίστη χρεία καὶ ἔρως ὀξύτατος ὕστατος μὲν ὁρμᾶται, διαπυρωτάτους δὲ τοὺς ἀνθρώπους μανίαις ἀπεργάζεται πάντως, ὁ περὶ τὴν τοῦ γένους σπορὰν ὕβρει πλείστῃ καόμενος. ἃ δὴ δεῖ τρία νοσήματα, τρέποντα εἰς τὸ βέλτιστον παρὰ τὸ λεγόμενον ἥδιστον, τρισὶ μὲν τοῖς μεγίστοις πειρᾶσθαι κατέχειν, φόβῳ καὶ νόμῳ καὶ τῷ ἀληθεῖ λόγῳ, προσχρωμένους μέντοι Μούσαις τε καὶ ἀγωνίοισι θεοῖς,

Thirdly comes our greatest need and keenest lust, which, though the latest to emerge, influences the soul of men with most raging frenzy—the lust for the sowing of offspring that burns with utmost violence. These three morbid states we must direct towards what is most good, instead of what is (nominally) most pleasant, trying to check them by means of the three greatest forces—fear, law, and true reasoning,—reinforced by the Muses and the Gods of Games, so as to quench thereby their increase and inflow.