The principal agent in breaking up the persistent medieval customs, which were so fixed that they seemed likely to last for ever, or till some historical catastrophe overwhelmed them, was the popular element in the ancient polity which was everywhere diffused in the Middle Ages. The Germanic tribes brought with them from their ancient dwelling-place a polity containing, like the classical, a king, a council, and a popular assembly; and wherever they went, they carried these elements and varied them, as force compelled or circumstances required. As far as England is concerned, the excellent dissertations of Mr. Freeman and Mr. Stubbs have proved this in the amplest manner, and brought it home to persons who cannot claim to possess much antiquarian learning. The history of the English Constitution, as far as the world cares for it, is, in fact, the complex history of the popular element in this ancient polity, which was sometimes weaker and sometimes stronger, but which has never died out, has commonly possessed great though varying power, and is now entirely predominant. The history of this growth is the history of the English people; and the discussions about this constitution and the discussions within it, the controversies as to its structure and the controversies as to its true effects, have mainly trained the English political intellect, in so far as it is trained. But in much of Europe, and in England particularly, the influence of religion has been very different from what it was in antiquity. It has been an influence of discussion. Since Luther's time there has been a conviction more or less rooted, that a man may by an intellectual process think out a religion for himself, and that, as the highest of all duties, he ought to do so. The influence of the political discussion, and the influence of the religious discussion, have been so long and so firmly combined, and have so effectually enforced one another, that the old notions of loyalty, and fealty, and authority, as they existed in the Middle Ages, have now over the best minds almost no effect.
It is true that the influence of discussion is not the only force which has produced this vast effect. Both in ancient and in modern times other forces cooperated with it. Trade, for example, is obviously a force which has done much to bring men of different customs and different beliefs into close contiguity, and has thus aided to change the customs and the beliefs of them all. Colonisation is another such influence: it settles men among aborigines of alien race and usages, and it commonly compels the colonists not to be over-strict in the choice of their own elements; they are obliged to coalesce with and 'adopt' useful bands and useful men, though their ancestral customs may not be identical, nay, though they may be, in fact, opposite to their own. In modern Europe, the existence of a cosmopolite Church, claiming to be above nations, and really extending through nations, and the scattered remains of Roman law and Roman civilisation co-operated with the liberating influence of political discussion. And so did other causes also. But perhaps in no case have these subsidiary causes alone been able to generate intellectual freedom; certainly in all the most remarkable cases the influence of discussion has presided at the creation of that freedom, and has been active and dominant in it.