"Nec eventus modo hoc docet, stultorum iste magister est, sed eadem ratio, quae fuit futuraque, donec res eaedem manebunt, immutabilis est."
Livy, History of Rome, Book 22
And it is not only the result that will instruct them, that teacher of fools, but reason itself, which was and will be unchanging, so long as the same fundamental conditions still hold.
"Senators disturb us by reminding us of the possibility of large numbers swarming from China; but the answer to all this is obvious and very simple. If the Chinese come here, they will come for citizenship or merely for labor. If they come for citizenship, then in this desire do they give a pledge of loyalty to our institutions; and where is the peril in such vows? They are peaceful and industrious; how can their citizenship be the occasion of solicitude?"
Senator Charles Sumner, 1870