Calumniae non temere credundum

Lucian of Samosata

Lucian, Vol. 1. Harmon, A. M., editor. London: William Heinemann, Ltd.; Cambridge, MA: Harvard University Press, 1913.

Therefore, when the enemy falls on with all these forces in league with him, he takes the fort by storm, I suppose, and his victory cannot even prove difficult, since nobody mans the walls or tries to repel his attacks. No, the hearer surrenders of his own accord, and the slandered person is not aware of the design upon him: slandered men are murdered in their sleep, just as when a city is captured in the night.