Plato, Laws 933a

εἴπομεν, σώμασι σώματα κακουργοῦσά ἐστιν κατὰ φύσιν· ἄλλη δὲ ἣ μαγγανείαις τέ τισιν καὶ ἐπῳδαῖς καὶ καταδέσεσι λεγομέναις πείθει τοὺς μὲν τολμῶντας βλάπτειν αὐτούς, ὡς δύνανται τὸ τοιοῦτον, τοὺς δʼ ὡς παντὸς μᾶλλον ὑπὸ τούτων δυναμένων γοητεύειν βλάπτονται. ταῦτʼ οὖν καὶ περὶ τὰ τοιαῦτα σύμπαντα οὔτε ῥᾴδιον ὅπως ποτὲ πέφυκεν γιγνώσκειν, οὔτʼ εἴ τις γνοίη, πείθειν εὐπετὲς ἑτέρους· ταῖς δὲ ψυχαῖς τῶν ἀνθρώπων δυσωπουμένους πρὸς ἀλλήλους

that we have now expressly mentioned is that in which injury is done to bodies by bodies according to nature’s laws. Distinct from this is the type which, by means of sorceries and incantations and spells (as they are called), not only convinces those who attempt to cause injury that they really can do so, but convinces also their victims that they certainly are being injured by those who possess the power of bewitchment. In respect of all such matters it is neither easy to perceive what is the real truth, nor, if one does perceive it, is it easy to convince others. And it is futile to approach the souls of men