What is the point of composing a speech that will convince no one that hears it?

Is it right, therefore,to compose discourses such that they will do the most good if they succeed in convincing no one among those who hear them? Isocrates berating a student's defense of a client. Isocrates. Busiris. Speech 11. Section 47.
In other words: What is the point of composing a speech that will convince no one that hears it?


Image: Marc Antony's Oration at the Funeral of Caesar by George Edward Robertson (PD)

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