Individuals will feel that private happiness is allied to public good: 

The weak, that instead of dividing their interests, they ought to unite them, because equality constitutes their force: 

The rich, that the measure of enjoyment is bounded by the constitution of the organs, and that lassitude follows satiety: 

The poor, that the employment of time, and the peace of the heart, compose the highest happiness of man.  And public opinion, reaching kings on their thrones, will force them to confine themselves to the limits of regular authority.

Even chance itself, serving the cause of nations, will sometimes give them feeble chiefs, who, through weakness, will suffer them to become free; and sometimes enlightened chiefs, who, from a principle of virtue, will free them.

And when nations, free and enlightened, shall become like great individuals, the whole species will have the same facilities as particular portions now have; the communication of knowledge will extend from one to another, and thus reach the whole.  By the law of imitation, the example of one people will be followed by others, who will adopt its spirit and its laws.  Even despots, perceiving that they can no longer maintain their authority without justice and beneficence, will soften their sway from necessity, from rivalship; and civilization will become universal.

There will be established among the several nations an equilibrium of force, which, restraining them all within the bounds of the respect due to their reciprocal rights, shall put an end to the barbarous practice of war, and submit their disputes to civil arbitration.* The human race will become one great society, one individual family, governed by the same spirit, by common laws, and enjoying all the happiness of which their nature is susceptible.

* What is a people?  An individual of the society at large.  What a war?  A duel between two individual people.  In what manner ought a society to act when two of its members fight?  Interfere and reconcile, or repress them.  In the days of the Abbe de Saint Pierre this was treated as a dream, but happily for the human race it begins to be realized.

Doubtless this great work will be long accomplishing; because the same movement must be given to an immense body; the same leaven must assimilate an enormous mass of heterogeneous parts.  But this movement shall be effected; its presages are already to be seen.  Already the great society, assuming in its course the same characters as partial societies have done, is evidently tending to a like result.  At first disconnected in all its parts, it saw its members for a long time without cohesion; and this general solitude of nations formed its first age of anarchy and childhood; divided afterwards by chance into irregular sections, called states and kingdoms, it has experienced the fatal effects of an extreme inequality of wealth and rank; and the aristocracy of great empires has formed its second age; then, these lordly states disputing for preeminence, have exhibited the period of the shock of factions.