Secondly, the other inference from the phenomenon of no military pay, and therefore no separate fighting profession, is this--that foreign war, war of aggression, war for booty, war for martial glory, is quite unknown. Now, all rules of political economy, applied to the maintenance of armies, must of course contemplate a regular trade of war pursued with those objects, and not a domestic war for beating off an attack upon hearths and altars. Such a war only, be it observed, could be lawfully entertained by the Jewish people. Mahomet, when he stole all his great ideas from the Mosaic and Christian revelations, found it inevitable to add one principle unknown to either: this was a religious motive for perpetual war of aggression, and such a principle he discovered in the imaginary duty of summary proselytism. No instruction was required. It was sufficient for the convert that, with or without sincerity, under terror of a sword at his throat, he spoke the words aloud which disowned all other faith than in Allah and Mahomet his prophet. It was sufficient for the soldier that he heard of a nation denying or ignoring Mahomet, to justify any atrocity of invasive warfare. But the Jews had no such commission--a proselyte needed more evidences of assent than simply to bawl out a short formula of words, and he who refused to become a proselyte was no object of persecution. Some nations have forced their languages upon others as badges of servitude. But the Romans were so far from treating _their_ language in this way, that they compelled barbarous nations on their frontier to pay for a license to use the Latin tongue. And with much more reason did the Jews, instead of wishing to obtrude their sublime religion upon foreigners, expect that all who valued it should manifest their value by coming to Jerusalem, by seeking instruction from the doctors of the law, and by worshipping in the outer court of the Temple.