Presuppositions that influence eschatology. If one is to understand where different views about eschatology originate from, then presuppositions of different theological systems must be identified. This article starts such an investigation by focusing on the relation between the two testaments in biblical theology. If the Old Testament is read through the lens of the New Testament, there is a risk that Old Testament truth may be forced into that prior grid. Further analysis follows – for example an investigation into the covenants – leading to a comparison of how presuppositions of covenant theology and dispensationalism impact their views about eschatology. Ways in which the Old Testament is fulfilled in the New Testament – direct, typological, analogical and summary fulfilment – are then considered and discussed. Guidelines for the relation between the two testaments in biblical theology are then proposed and illustrated with an example.