The title chosen for this book sets forth the contents of the inspired message revealed to St. John, the Apostle. It is a summing up of the prophetical work in the Bible by the Holy Spirit and a revelation of the Great Causes shaping future history which will constitute the destiny of mankind. This destiny will be created and developed by man's free will. It is the Book of Destiny, because it shows forth the destiny of the whole human race. It is building up now and will grow until the Day of Judgment. This building up began with the renewed persecution of the Christians by Trajan after the benign lull under the Emperor Nerva. The Apocalypse received its name from the first word of these revelations. Whether St. John gave it this name or not cannot be established. The secrets of the future written in this book have mystified and intrigued the minds of the most inquisitive for nineteen hundred years. St. Vincent Ferrer five hundred years ago and St. Bernardine of Siena a half a century later threatened their hearers with the judgments enumerated in the Apocalypse, but their words were not well heeded. Yet the FIRST WOE was averted from the countries which they evangelized. For a hundred years now the secrets have been quite openly expressed and written about, though with some uncertainty and misgivings, but have not been noticed by the world. In the meantime events have succeeded with increasing speed and growth towards a denouement of the secrets of the GREAT WORLD DRAMA so long wrapped up in mysterious visions. Any day may flash upon the consciousness of men the DESTINY towards which mankind is hastening.