For either through want of sense they form incorrect
opinions, or, if their opinions are correct, through viciousness they do not say
what they think, or, if they are sensible and good,1
they lack goodwill; wherefore it may happen that they do not give the best
advice, although they know what it is. These qualities are all that are
necessary, so that the speaker who appears to possess all three will necessarily
convince his hearers.
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