Against these causes of the discovery of conspiracies it is impossible so to guard as that either through treachery, want of caution, or levity, the secret shall not be found out, whenever more than three or four persons are privy to it. And whenever more than one conspirator is arrested, the plot is certain to be detected, because no two persons can perfectly agree in a false account of what has passed between them. If only one be taken, should he be a man of resolute courage, he may refuse to implicate his comrades; but they on their part must have no less courage, to stay quiet where they are, and not betray themselves by flight; for if courage be absent anywhere, whether in him who is taken or in those still at large, the conspiracy is revealed. And what is related by Titus Livius as having happened in the conspiracy against Hieronymus, tyrant of Syracuse, is most extraordinary, namely, that on the capture of one of the conspirators, named Theodorus, he, with great fortitude, withheld the names of all his accomplices, and accused friends of the tyrant; while his companions, on their part, trusted so completely in his courage, that not one of them quitted Syracuse or showed any sign of fear.
All these dangers, therefore, which attend the contrivance of a plot, must be passed through before you come to its execution; or if you would escape them, you must observe the following precautions: Your first and surest, nay, to say truth, your only safeguard, is to leave your accomplices no time to accuse you; for which reason you must impart the affair to them, only at the moment when you mean it to be carried out, and not before. Those who have followed this course have wholly escaped the preliminary dangers of conspiracies, and, generally speaking, the others also; indeed, I may say that they have all succeeded, and that it is open to every prudent man to act as they did.