Two of Belloc's works in one volume. In The Great Heresies, the great Catholic historian analyzes five of the greatest heresies of all time: Arianism, Mohammedanism (Islam), Albigensianism, Protestantism, and the Modern Attack, showing that the world would be vastly different today if Arianism or Albigensianism had survived--and how it is different because Protestantism survived. He predicts the re-emergence of Islam and explains how the Modern Attack is the worst threat to the Catholic Church ever.
In Survivals and New Arrivals, he analyzes the position of the Catholic Church in the world today, particularly as seen vis-a-vis her enemies. It is the Church's enemies, he maintains, and the nature of their attacks upon her, that reveal what exactly is her place and influence upon the world at any given point of history-and what are her opportunities for success. The enemies of the Church, he says, always consist of three sorts: The Survivals, or those enemies whose major attacks are on the wane, though still surviving; the Main Opposition, whose attacks are presently at their peak; and the New Arrivals, or those enemies of the Church that are just coming into the battle, whose attacks against the Church are just beginning or are only in the bud.