SOCRATES: Now I want to know about rhetoric in the same way;—is rhetoric the only art which brings persuasion, or do other arts have the same effect? I mean to say—Does he who teaches anything persuade men of that which he teaches or not?
GORGIAS: He persuades, Socrates,—there can be no mistake about that.
SOCRATES: Again, if we take the arts of which we were just now speaking:—do not arithmetic and the arithmeticians teach us the properties of number?
GORGIAS: Certainly.
SOCRATES: And therefore persuade us of them?
GORGIAS: Yes.
SOCRATES: Then arithmetic as well as rhetoric is an artificer of persuasion?
GORGIAS: Clearly.
SOCRATES: And if any one asks us what sort of persuasion, and about what,—we shall answer, persuasion which teaches the quantity of odd and even; and we shall be able to show that all the other arts of which we were just now speaking are artificers of persuasion, and of what sort, and about what.
GORGIAS: Very true.