Apophthegmata Laconica

Plutarch

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

This is the answer of Hippocratidas to the governor of Caria who wrote a letter to him because

a man from Sparta had been privy to the plot of certain conspirators, and had said nothing about it; and the governor added a line, asking how he should deal with him. Hippocratidas wrote in reply: If you have done him any great favour, put him to death; but if not, expel him from your country, for he is a poltroon so far as any virtue is concerned.