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Vanity: "Diplomatists, especially those who are appointed to, and liable to remain in, smaller posts, are apt to pass by slow gradations from ordinary human vanity to an inordinate sense of their own importance. The whole apparatus of diplomatic life — the ceremonial, the court functions, the large houses, the lackeys and the food — induces an increasing sclerosis of personality."
— Harold Nicolson
Vanity: "The dangers of vanity in a negotiator can scarcely be exaggerated. It tempts him to disregard the advice or opinions of those who may have had longer experience of a country, or of a problem, than he possesses himself. It renders him vulnerable to the flattery or attacks of those with whom he is negotiating. It encourages him to take too personal a view of the nature and purposes of his functions and in extreme cases to prefer a brilliant but undesirable triumph to some unostentatious but more prudent compromise. It leads him to boast of victories and thereby to incur the hatred of those whom he has vanquished. It may prevent him, at some crucial moment, from confessing to his government that his predictions or his information were incorrect. It prompts him to incur or to provoke unnecessary friction over matters which are of purely social importance. It may cause him to offend by ostentation or ordinary vulgarity. It is at the root of all indiscretion and most tactlessness. It lures its addicts into displaying their own verbal brilliance, and into such fatal diplomatic indulgences as irony, epigrams, insinuations, and the barbed reply. ... And it may bring its train those other vices of imprecision, excitability, impatience, emotionalism and even untruthfulness."
— Harold Nicolson
[See also, Influence, virtues from which derived]
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Chas W. Freeman Jr. (The Diplomat's Dictionary)