Plato, Laws 933c

μὴ δεῖν ἐπιχειρεῖν τοιοῦτο δρᾶν μηδὲ καθάπερ παῖδας τοὺς πολλοὺς τῶν ἀνθρώπων δειμαίνοντας φοβεῖν, μηδʼ αὖ τὸν νομοθέτην τε καὶ τὸν δικαστὴν ἀναγκάζειν ἐξιᾶσθαι τῶν ἀνθρώπων τοὺς τοιούτους φόβους, ὡς πρῶτον μὲν τὸν ἐπιχειροῦντα φαρμάττειν οὐκ εἰδότα τί δρᾷ, τά τε κατὰ σώματα, ἐὰν μὴ τυγχάνῃ ἐπιστήμων ὢν ἰατρικῆς, τά τε αὖ περὶ τὰ μαγγανεύματα, ἐὰν μὴ μάντις ἢ τερατοσκόπος ὢν τυγχάνῃ.

to commit such an act, or to frighten the mass of men, like children, with bogeys, and so compel the legislator and the judge to cure men of such fears, inasmuch as, first, the man who attempts poisoning knows not what he is doing either in regard to bodies (unless he be a medical expert) or in respect of sorceries (unless he be a prophet or diviner). So this statement shall stand