The choice of a prince's ministers is a matter of no little importance; they are either good or not according to the prudence of the prince. The first impression that one gets of a ruler and of his brains is from seeing the men that he has about him. When they are competent and faithful one can always consider him wise, as he has been able to recognise their ability and keep them faithful. But when they are the reverse, one can always form an unfavourable opinion of him, because the first mistake that he makes is in making this choice. There was nobody who knew Messer Antonio da Venafro as the minister of Pandolfo Petrucci, Prince of Siena, who did not consider Pandolfo to be a very prudent man, having him for his minister. There are three different kinds of brains, the one understands things unassisted, the other understands things when shown by others, the third understands neither alone nor with the explanations of others. The first kind is most excellent, the second also excellent, but the third useless. It is therefore evident that if Pandolfo was not of the first kind, he was at any rate of the second. For every time that one has the judgment to know the good and evil that any one does or says, even if he has no invention, yet he recognises the bad and good works or his minister and corrects the one and supports the other; and the minister cannot hope to deceive him and therefore remains good. For a prince to be able to know a minister there is this method which never fails. When you see the minister think more of himself than of you, and in all his actions seek his own profit, such a man will never be a good minister, and you can never rely on him; for whoever has in hand the state of another must never think of himself but of the prince, and not call to mind anything but what relates to him. And, on the other hand, the prince, in order to retain his fidelity ought to think of his minister, honouring and enriching him, doing him kindnesses, and conferring on him honours and giving him responsible tasks, so that the great honours and riches bestowed on him cause him not to desire other honours and riches, and the tasks he has to fulfil make him fearful of changes, knowing that he could not execute them without the prince. When princes and their ministers stand in this relation to each other, they can rely the one upon the other; when it is otherwise, the end is always injurious either for one or the other of them.