The institutions whereby the Roman commonwealth was led back to its starting point, were the tribuneship of the people and the censorship, together with all those laws which were passed to check the insolence and ambition of its citizens. Such institutions, however, require fresh life to be infused into them by the worth of some one man who fearlessly devotes himself to give them effect in opposition to the power of those who set them at defiance.
Of the laws being thus reinforced in Rome, before its capture by the Gauls, we have notable examples in the deaths of the sons of Brutus, of the Decemvirs, and of Manlius Frumentarius; and after its capture, in the deaths of Manlius Capitolinus, and of the son of Manlius Torquatus in the prosecution of his master of the knights by Papirius Cursor, and in the impeachment of the Scipios. Such examples as these, being signal and extraordinary, had the effect, whenever they took place, of bringing men back to the true standard of right; but when they came to be of rarer occurrence, they left men more leisure to grow corrupted, and were attended by greater danger and disturbance. Wherefore, between one and another of these vindications of the laws, no more than ten years, at most, ought to intervene; because after that time men begin to change their manners and to disregard the laws; and if nothing occur to recall the idea of punishment, and unless fear resume its hold on their minds, so many offenders suddenly spring up together that it is impossible to punish them without danger. And to this purport it used to be said by those who ruled Florence from the year 1434 to 1494 , that their government could hardly be maintained unless it was renewed every five years; by which they meant