Page:The Practice of Diplomacy - Callières - Whyte - 1919.djvu/146

 their jealousy. And even the most practised and reliable ministers are not always on their guard. I have seen highly trained and well-proven statesmen who none the less in the course of conversation, and by other signs, allowed expressions to escape them which gave important clues to their policy. And there are courtiers at every court who, though not members of the King's Council, know by long practice how to discover a secret, and who are always prepared to reveal it in order to show their own importance and their penetration. It is almost impossible to conceal from an active, observant, and enlightened negotiator any important design of public policy, for no departure of state can ever be made without great preparation which entails the sharing of many secrets by many persons, and this is a danger against which it is almost impossible to guard even by those who take the greatest precautions.

Now in the transmission of information of this kind the negotiator must give an exact account of all the circumstances surrounding it, that is to say, how and by whom he acquired it; and he should accompany it with his own comments and conjectures in order that the prince may be fully informed, and may be able to judge whether the conclusions drawn from all the circumstances are well or ill founded. There are certain things which