A stranger having publicly said, that he could teach Dionysius, the tyrant of Syracuse, an infallible way to find out and discover all the conspiracies his subjects could contrive against him, if he would give him a good sum of money for his pains, Dionysius hearing of it, caused the man to be brought to him, that he might learn an art so necessary to his preservation. The man made answer, that all the art he knew, was, that he should give him a talent, and afterwards boast that he had obtained a singular secret from him. Dionysius liked the invention, and accordingly caused six hundred crowns to be counted out to him. --[Plutarch, Apothegms.]--It was not likely he should give so great a sum to a person unknown, but upon the account of some extraordinary discovery, and the belief of this served to keep his enemies in awe. Princes, however, do wisely to publish the informations they receive of all the practices against their lives, to possess men with an opinion they have so good intelligence that nothing can be plotted against them, but they have present notice of it. The Duke of Athens did a great many foolish things in the establishment of his new tyranny over Florence: but this especially was most notable, that having received the first intimation of the conspiracies the people were hatching against him, from Matteo di Morozzo, one of the conspirators, he presently put him to death, to suppress that rumour, that it might not be thought any of the city disliked his government.