This work focuses on refining and finding quotations of Greek Church Fathers within the Septuaginta and the Greek New Testament. Our corpus features over 700 works of various Church Fathers, which amounts to around ten million words. In order to reach our aim, we had to explore the notion of quotation as relevant to the first centuries of our era, and to discuss the efficiency and usability of modern digital approaches, including their evaluation metrics. We mainly studied unsupervised approaches, either statistical, statistico-structural and statistico-semantic. We ended up building a generic and flexible solution based on a robust document model and an algorithm merging several other approaches. We are currently working on implementing this solution within the GATE framework to facilitate reusability. In this article, we will talk about aspects of the challenges, the model we built to ensure genericity and flexibility, the algorithm we built from the various approaches we explored and discuss our results applying this algorithm to two different control sets.