It is very painful to most minds to admit that the past does not furnish us with reliable, permanent standards of conduct and of public policy. We resent the imputation that things are not going, on the whole, pretty well, and find excuses for turning our backs on disconcerting and puzzling facts. We are full of respectable fears and a general timidity in the face of conditions which we vaguely feel are escaping control in spite of our best efforts to prevent any thoroughgoing readjustment. We instinctively try to show that Mr. Keynes must surely be wrong about the Treaty of Versailles; that Mr. Gibbs must be perversely exaggerating the horrors of modern war; that Mr. Hobson certainly views the industrial crisis with unjustifiable pessimism; that "business as usual" cannot be that socially perverse and incredibly inexpedient thing Mr. Veblen shows it to be; that Mr. Robin's picture of Lenin can only be explained by a disguised sympathy for Bolshevism. Yet, even if we could assume that traditional opinion is a fairly clear and reliable reflection of hard-earned experience, surely it should have less weight in our day and generation than in the past. For changes have overtaken mankind which have fundamentally altered the conditions in which we live, and which are revolutionizing the relations between individuals and classes and nations. Moreover, we must remember that knowledge has widened and deepened, so that, could any of us really catch up with the information of our own time, he would have little temptation to indulge the mediaeval habit of appealing to the authority of the past. The Christian Epic did not have to rely for its perpetuation either on its intellectual plausibility or its traditional authority. During the Middle Ages there developed a vast and powerful religious State, the mediaeval Church, the real successor, as Hobbes pointed out, to the Roman Empire; and the Church with all its resources, including its control over "the secular arm" of kings and princes, was ready to defend the Christian beliefs against question and revision. To doubt the teachings of the Church was the supreme crime; it was treason against God himself, in comparison with which--to judge from mediaeval experts on heresy--murder was a minor offense.