This volume contains the written versions of the lectures delivered by the participants of the Colloquium Origenianum Nonum held in Pecs (Hungary, 29 August - 2 September 2005). The main topic of the conference was Origen and the religious practice of his time. Here 49 scholars from some 18 countries publish their newest findings on the greatest and most influential Christian thinker before Augustine, who laid the foundation of the Biblical textual studies, created systematic theology, and was regarded as an authentic spiritual leader of Christianity. The papers not only provide the best overview on a lively field of studies but also demonstrate how Origen's heritage in Christian history, theology and spirituality carried with it the imprint of one of the most vital traditions of our civilization. Similarly to the volumes of the earlier conferences (Boston 1989, Chantilly 1993, Hofgeismar-Marburg 1997 and Pisa 2001), the contributions are published by the series Bibliotheca Ephemeridum Theologicarum Lovaniensium.