This paper focuses on three issues. First, it is about the context and environment of pre-Nicene theology. It is emphasized that pre-Nicene theology did not neglect ca-techetical and liturgical reflection (ad intra) while at the same time successfully ente-red into a critical and creative dialogue with both the Semitic and Greco-Roman world where first Christians lived (ad extra). For contemporary theology its means that it cannot reject historical reasoning, placed in space and time. The second part stresses that, in spite of different situations and all historical and cultural contexts, theology before Nicea was above all an understanding of Sacred Scripture to which the key is the Risen Christ as the source and definitive fulfilment of the inspired writings. Finally, the third part of the paper focuses on the existential and spiritual experience from which pre-Nicene theology originated. For this theology the Gospel of Christ is not just the rule of faith but also the rule of life. This leads to a conclusion that a contem-porary theologian is a to take up an existential-personalistic reflection on Revelation using the historical-hermeneutic method .