Machiavelli believed that diplomacy, unlike military service, was of no significance for civic virtue, and that in foreign policy it was no substitute for arms and money. Nevertheless, it enhanced the virtù of even the strongest prince. It was for this and other reasons that Machiavelli also believed that the good faith on which negotiation depends was generally observed. His view that promises need not outlast the conditions that produce them is an escape clause that is equally necessary. Machiavelli does not deserve the charge, laid at his door by Harold Nicolson, of corrupting the art of diplomacy.