"Gratitude is a virtue which, according to the general apprehension of mankind, approaches more nearly than almost any other social virtue to justice."

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The laws of war, that restrain the exercise of national rapine and murder, are founded on two principles of substantial interest: the knowledge of the permanent benefits which may be obtained by a moderate use of conquest, and a just apprehension lest the desolation which we inflict on the enemy's country may be retaliated on our own. But these considerations of hope and fear are almost unknown in the pastoral state of nations.

— Edward Gibbon