Apophthegmata Laconica

Plutarch

Plutarch. Moralia, Vol. III. Babbitt, Frank Cole, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1931 (printing).

Theopompus, in answer to a man who asked how anyone could keep a kingdom most securely, said, If he concede to his friends their just share of frank speech, and, so far as lies in his power, do not suffer any of his subjects to be wronged.