Instituta Laconia
Plutarch
Plutarch. Moralia, Vol. III. Babbitt, Frank Cole, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1931 (printing).
Cephisophon, who asserted that he could speak the whole day long on any topic whatsoever, they expelled from the country, saying that the good orator must keep his discourse equal to the subject in hand.[*](Cf.Moralia, 208 c (3), supra.)