Fundamental to Metz's work is the concept of "dangerous memory", which relates to "anamnesis" in the Greek New Testament, a term which is central to the theology of the Eucharist. Metz spoke variously of "the dangerous memory of Jesus Christ", "the dangerous memory of freedom (in Jesus Christ)", the "dangerous memory of suffering", etc. One of the motivating factors for this category is Metz's determination, as a Christian theologian from Germany, to rework the whole of Christian theology from the ground up in light of the disruptive experience of the Holocaust. This need explains in part his break with Rahner, whose transcendental method appeals to historicity but does not come to terms with actual history. Metz was in dialogue with progressive Marxism, especially Walter Benjamin and the authors of the Frankfurt School. He levelled a fierce critique of what he called bourgeois Christianity and believed that the Christian Gospel had become less credible because it had become entangled with bourgeois religion. His work "Faith in History and Society" develops apologetics, or fundamental theology, from this perspective.