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“Thus he who would enter the profession of diplomacy must examine himself to see whether he was born with the qualities necessary for success. These qualities are an observant mind, a spirit of application which refuses to be distracted by pleasures or frivolous amusements, a sound judgement which takes the measure of things as they are, and which goes straight to its goal by the shortest and most natural paths without wandering into useless refinements and subtleties which as a rule only succeed in repelling those with whom one is dealing. The negotiator must further possess that penetration which enables him to discover the thoughts of men and to know by the least movement of their countenances what passions are stirring within, for such movements are often betrayed even by the most practised negotiator.”
― François de Callières, On the Manner of Negotiating with Princes: From Sovereigns to CEOs, Envoys to Executives -- Classic Principles of Diplomacy and the Art of Negotiation