This early, fundamental work shows how Christianity arose out of what was prepared in the pre-Christian Mysteries. Christianity, however, was not merely a further development of what existed in these Mysteries but something unique and independent. From an examination of the ancient Mysteries, Steiner goes on to discuss the Gospels, the Lazarus miracle, the Apocalypse of St. John, Jesus and his historical background, and more. This book is a foundation for what Steiner later more fully develops concerning the nature of Christ and Christianity. It was originally published in German as, Das Christentum Als Mystische Tatsache und die Mysterien des Altertums.
As his source for many of the classical quotations included in Christianity as Mystical Fact, Rudolf Steiner used Otto Willman's Geschichte des Idealismus, History of Idealism. The present translators have referred to original texts wherever possible for this edition of Steiner's book.
In dieser frühen Schrift stellt Rudolf Steiner das Wesen des Christentums und seine geistesgeschichtliche Stellung in der Menschheitsentwicklung dar. Mit Christi Leben, Tod und Auferstehung ist die Erfüllung und zugleich die Überwindung der antiken Mysterien gegeben.