Regum et imperatorum apophthegmata

Plutarch

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

Lamachus reprimanded one of his captains who had made a mistake, and when the man vowed he would never do it again, Lamachus said, In war there is no room for two mistakes.