The relationship between the Christ event and the four Gospels stands at the center of Rudolf Steiner's spiritual-scientific work, and the volumes gathered in this portal represent his most sustained and systematic treatment of that theme. Across lecture cycles spanning roughly 1907 to 1914, Steiner approaches the Gospels not as documents to be harmonized by conventional biblical criticism but as records of initiatory experience, each written from a distinct vantage point within the ancient mystery traditions. GA 103 and GA 112 examine the Gospel of John as a text encoding the stages of Christian initiation, while GA 114 and GA 123 treat the Gospels of Luke and Matthew respectively as expressions of complementary spiritual streams — the one rooted in Buddhist-bodhisattva wisdom, the other in the Zarathushtrian and Mosaic heritage. GA 131 addresses the inner nature of Christ directly, and GA 148 explores the supersensible dimensions of the Christ being in relation to cosmic evolution.