Regum et imperatorum apophthegmata
Plutarch
Plutarch. Moralia, Vol. III. Babbitt, Frank Cole, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1931 (printing).
When one of the helots conducted himself rather boldly towards him, he said, By Heaven, I would kill you if I were not angry. [*](Cf. Moralia, 232 D, infra.)