For not upon mind, gentlemen, not upon mind, but upon morals, is human welfare founded. The true subjective history of man is the history not of his thought, but of his conscience; the true objective history of man is not that of his inventions, but of his vices and his virtues. So far from morals depending upon thought, thought, I believe, depends on morals. In proportion as a nation is righteous,--in proportion as common justice is done between man and man, will thought grow rapidly, securely, triumphantly; will its discoveries be cheerfully accepted, and faithfully obeyed, to the welfare of the whole commonweal. But where a nation is corrupt, that is, where the majority of individuals in it are bad, and justice is not done between man and man, there thought will wither, and science will be either crushed by frivolity and sensuality, or abused to the ends of tyranny, ambition, profligacy, till she herself perishes, amid the general ruin of all good things; as she had done in Greece, in Rome, in Spain, in China, and many other lands. Laws of economy, of polity, of health, of all which makes human life endurable, may be ignored and trampled under foot, and are too often, every day, for the sake of present greed, of present passion; self-interest may become, and will become, more and more blinded, just in proportion as it is not enlightened by virtue; till a nation may arrive, though, thank God, but seldom, at that state of frantic recklessness which Salvian describes among his Roman countrymen in Gaul, when, while the Franks were thundering at their gates, and starved and half-burnt corpses lay about the unguarded streets, the remnant, like that in doomed Jerusalem of old, were drinking, dicing, ravishing, robbing the orphan and the widow, swindling the poor man out of his plot of ground, and sending meanwhile to the tottering Caesar at Rome, to ask, not for armies, but for Circensian games. We cannot see how science could have bettered those poor Gauls. And we can conceive, surely, a nation falling into the same madness, and crying 'Let us eat and drink, for to-morrow we die,' in the midst of railroads, spinning-jennies, electric telegraphs, and crystal palaces, with infinite blue-books and scientific treatises ready to prove to them, what they knew perfectly well already, that they were making a very unprofitable investment, both of money and of time.