Based on the information given, it should be noted that the qualities of the speech that was used include rhetoric and persuasion.
From the information, it can be seen that Gorgias likens good oratory to witchcraft and spell binding and the qualities that he used speech was to intoxicate the audience.
In this case, he used rhetoric and persuasion. It should be noted that rhetoric is an act of persuasion. They are both used to make the audience agree to a particular point.
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