The Prince by Niccolo Machiavelli Chapter 18 Page 6

humanity, and religion. And there is no virtue which it is more necessary for him to seem to possess than this last; because men in general judge rather by the eye than by the hand, for every one can see but few can touch. Every one sees what you seem, but few know what you are, and these few dare not oppose themselves to the opinion of the many who have the majesty of the State to back them up.

Moreover, in the actions of all men, and most of all of Princes, where there is no tribunal to which we can appeal, we look to results. Wherefore if a Prince succeeds in establishing and maintaining his authority, the means will always be judged honourable and be approved by every one. For the vulgar are always taken by appearances and by results, and the world is made up of the vulgar, the few only finding room when the many have no longer ground to stand on.