Alexander of Aphrodisias, De anima libri mantissa

καὶ λαβόντες βοηθοὺς τοὺς καὶ τῆς τέχνης αὐτοῖς αἰτίους, ἀναπείθουσιν τοὺς πλείστους τῶν ἀνθρώπων, ἐν ταῖς περιστάσεσιν αὐτοῖς ἐπιτιθέμενοι καὶ ταῖς συμφοραῖς, μόνον οὐκ εὐχομένοις τοῦθ’ οὕτως ἔχον φανῆναι, κατά τινα τριβήν τε καὶ περὶ τὰ τοιαῦτα σύνεσιν καὶ τῆς ἐν τοῖς τοιούτοις ἀκολουθίας θεωρίαν προλέγοντες εὐστόχως τινὰ τῶν τοῖς οὕτως ἔχουσιν ἀκολούθως ἐσομένων, ὡς δὴ τοῦτ’ ἐκ τῆς τέχνης τῆς περὶ τὴν εἱμαρμένην ἔχειν λέγοντες μισθοὺς οὐκ ὀλίγους ὑπὲρ τῆς τοιαύτης κακοτε χνίας ἐκλέγοντες, ἀσμένως αὐτοῖς τῶν πειρωμένων διδόντων ὡς βοηθοῖς καὶ συνηγόροις τῶν οἰκείων ἁμαρτημάτων.

And taking as their helpers the very people who are also the cause of their art, they persuade most men, setting upon them in their difficulties and misfortunes, when they all but pray that this should prove to be so; and through a certain practice and understanding of such matters, and study of the sequence of events in such cases, they shrewdly foretell some of the things that will follow in consequence for people in that situation, claiming of course that they have this from the art concerned with fate, and collecting no small fees for such malpractice, while those who consult them gladly pay them as helpers and advocates of their own faults.