Whence it resulted that as the people neither feared nor coveted the power which they did not possess, the conflicts which might have arisen between them and the nobles were escaped, together with the causes which would have led to them; and in this way they were able to live long united.

But of this unity in Sparta there were two chief causes: one, the fewness of its inhabitants, which allowed of their being governed by a few; the other, that by denying foreigners admission into their country, the people had less occasion to become corrupted, and never so increased in numbers as to prove troublesome to their few rulers.
Weighing all which circumstances, we see that to have kept Rome in the same tranquility wherein these republics were kept, one of two courses must have been followed by her legislators; for either, like the Venetians, they must have refrained from employing the commons in war, or else, like the Spartans, they must have closed their country to foreigners.

Whereas, in both particulars, they did the opposite, arming the commons and increasing their number, and thus affording endless occasions for disorder.

And had the Roman commonwealth grown to be more tranquil, this inconvenience would have resulted, that it must at the same time have grown weaker, since the road would have been closed to that greatness to which it came, for in removing the causes of her tumults, Rome must have interfered with the causes of her growth.
And he who looks carefully into the matter will find, that in all human affairs, we cannot rid ourselves of one inconvenience without running into another.

So that if you would have your people numerous and warlike, to the end that with their aid you may establish a great empire, you will have them of such a sort as you cannot afterwards control at your pleasure; while should you keep them few and unwarlike, to the end that you may govern them easily, you will be unable, should you extend your dominions, to preserve them, and will become so contemptible as to be the prey of any who attack you.