History of the Peloponnesian War

And whoever contends that words are not to be the exponents of measures, is either wanting in understanding, or self-interested: wanting in understanding if he thinks it possible to express himself many other way on what is future and not certain; self-interested, if, when wishing to persuade to something base, he thinks that he could not speak to his credit on a discreditable subject, but that by clever calumniation he might confound both his opponents and audience. But most cruel of all are those who charge us besides with a display [of rhetoric] for pecuniary motives.