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 a garrulous barber asked him, How shall I cut your hair ? he said, In silence. [*](Cf. Moralia, 509 A.)