In proportion as we are habituated to any subject, or any class of operations, our decisions are rapid and independent of deliberation. An expert geometer sees at a glance whether a demonstration is correct. In extempore speech, a person has to perform every moment a series of judgments as to the suitability of words to meaning, to grammar, to taste, to effect upon an audience. An old soldier knows in an instant, without thought or deliberation, whether a position is sufficiently guarded. There is no greater rapidity in the judgments of right and wrong, than in these acquired professional judgments. Moreover, the decisions of conscience are quick only in the simpler cases. It happens not unfrequently that difficult and protracted deliberations are necessary to a moral judgment. 6. Secondly, The alleged similarity of men's moral judgments in all countries and times holds only to a limited degree. The very great differences among different nations, as to what constitutes right and wrong, are too numerous, striking, and serious, not to have been often brought forward in Ethical controversy. Robbery and murder are legalized in whole nations. Macaulay's picture of the Highland Chief of former days is not singular in the experience of mankind. 'His own vassals, indeed, were few in number, but he came of the best blood of the Highlands. He kept up a close connexion with his more powerful kinsmen; nor did they like him the less because he was a robber; for he never robbed them; and that robbery, merely as robbery, was a wicked and disgraceful act, had never entered into the mind of any Celtic chief.' Various answers have been given by the advocates of innate morality to these serious discrepancies. (1) It is maintained that savage or uncultivated nations are not a fair criterion of mankind generally: that as men become more civilized, they approximate to unity of moral sentiment; and what civilized men agree in, is alone to be taken as the judgment of the race. Now, this argument would have great weight, in any discussion as to what is good, useful, expedient, or what is in accordance with the cultivated reason or intelligence of mankind; because civilization consists in the exercise of men's intellectual faculties to improve their condition. But in a controversy as to what is given us by nature,--what we possess independently of intelligent search and experience,--the appeal to civilization does not apply. What civilized men agree upon among themselves, as opposed to savages, is likely to be the reverse of a natural instinct; in other words, something suggested by reason and experience.