Machiavelli, Discourses on Livy
I then only remained to assign its place to the popular element, and the Roman nobles growing insolent from causes which shall be noticed hereafter, the commons against them, when, not to lose the whole of their power, they were forced to concede a share to the people; while with the share which remained, the senate and consults retained so much authority that they still held their own place in the republic. In this way the tribunes of the people came to be created, after whose creation the stability of the State was much augmented, since each the three forms of government had now is due influence allowed it. And such was the good fortune of Rome that although her government passed from the kings to the nobles, and from these to the people, by the steps and for the reasons noticed above, still the entire authority of the kingly element was not sacrificed to strengthen the authority of the nobles, nor were the nobles divested of their authority to bestow it on the commons; but three, blending together, made up a perfect State; which perfection, as shall be fully shown in the next two Chapters, was reached through the dissensions of the commons and the senate.
