This is all that occurs to me to say on the subject of conspiracies.  If I have noticed those which have been carried out with the sword rather than those wherein poison has been the instrument, it is because, generally speaking, the method of proceeding is the same in both.  It is true, nevertheless, that conspiracies which are to be carried out by poison are, by reason of their uncertainty, attended by greater danger.  For since fewer opportunities offer for their execution, you must have an understanding with persons who can command opportunities.  But it is dangerous to have to depend on others.  Again, many causes may hinder a poisoned draught from proving mortal; as when the murderers of Commodus, on his vomiting the poison given him, had to strangle him.

Princes, then, have no worse enemy than conspiracy, for when a conspiracy is formed against them, it either carries them off, or discredits them:  since, if it succeeds, they die; while, if it be discovered, and the conspirators be put to death themselves, it will always be believed that the whole affair has been trumped up by the prince that he might glut his greed and cruelty with the goods and blood of those whom he has made away with.  Let me not, however, forget to warn the prince or commonwealth against whom a conspiracy is directed, that on getting word of it, and before taking any steps to punish it, they endeavour, as far as they can, to ascertain its character, and after carefully weighing the strength of the conspirators with their own, on finding it preponderate, never suffer their knowledge of the plot to appear until they are ready with a force sufficient to crush it.  For otherwise, to disclose their knowledge will only give the signal for their destruction.  They must strive therefore to seem unconscious of what is going on; for conspirators who see themselves detected are driven forward by necessity and will stick at nothing.  Of this precaution we have an example in Roman history, when the officers of the two legions, who, as has already been mentioned, were left behind to defend the Capuans from the Samnites, conspired together against the Capuans.  For on rumours of this conspiracy reaching Rome, Rutilius the new consul was charged to see to it; who, not to excite the suspicions of the conspirators, publicly gave out that by order of the senate the Capuan legions were continued in their station.  The conspirators believing this, and thinking they would have ample time to execute their plans, made no effort to hasten matters, but remained at their ease, until they found that the consul was moving one of the two legions to a distance from the other.  This arousing their suspicion, led them to disclose their designs and endeavour to carry them out.