This book needs a preliminary note that its scope be not misunderstood. The view suggested is historical rather than theological, and does not deal directly with a religious change which has been the chief event of my own life; and about which I am already writing a more purely controversial volume. It is impossible, I hope, for any Catholic to write any book on any subject, above all this subject, without showing that he is a Catholic; but this study is not specially concerned with the differences between a Catholic and a Protestant. Much of it is devoted to many sorts of Pagans rather than any sort of Christians; and its thesis is that those who say that Christ stands side by side with similar myths, and his religion side by side with similar religions, are only repeating a very stale formula contradicted by a very striking fact. To suggest this I have not needed to go much beyond matters known to us all; I make no claim to learning; and have to depend for some things, as has rather become the fashion, on those who are more learned. As I have more than once differed from Mr. H. G. Wells in his view of history, it is the more right that I should here congratulate him on the courage and constructive imagination which carried through his vast and varied and intensely interesting work; but still more on having asserted the reasonable right of the amateur to do what he can with the facts which the specialists provide. (Prefatory Note)