David Hume,
The History of England in Three Volumes…
“ It is certain that the principle of retaliation may serve in some cases as a full apology, in others as an alleviation, for a conduct which would otherwise be exposed to great blame. But these infamous arts, which poison justice in its very source, and break all the bands of human society, are so detestable and dangerous, that no pretence of retaliation can be pleaded as an apology or even an alleviation of the crime incurred by them. ”
