But these appeals to the judgment of their congregations by the clergy are also a proof that in the fourteenth century the opinion of the people did not count for so little as is often supposed in the making of peace and war. Yet the power of the people in this respect was doubtless as insignificant as it still is in our own days: nothing being more remarkable, even in the free government of modern England, than the influence of the people in theory and their influence in fact on the most important question that regards their destinies. Nor are the moral causes difficult to trace which in those times made wars break out so frequently and last so long, that those who now read of them can only marvel how civilisation ever emerged at all, even to the imperfect degree to which it is given to us to enjoy it. The love of adventure and the hope of fame were of course among the principal motives. The saying of Adam Smith, that the great secret of education is the direction of personal vanity to proper objects, contains the key to all advance that has ever been made in civilisation, and to every shortcoming. The savagery of the middle ages was due to the direction of personal vanity exclusively into military channels, so that the desire for distinction often displayed itself in forms of perfect absurdity, as in the case of the young English knights who went abroad with one eye veiled, binding themselves by a vow to their ladies neither to see with their eyes nor to reply to anything asked of them till they had signalised themselves by the performance of some wondrous deed in France. The gradual opening up in later days of other paths to distinction than that of arms has very much diminished the danger to the public peace involved in the worthless education of our ancestors.