The momentous paradigm shift from God as Being to God as Person provides us with the context for gaining a firm grasp of Luther's own redefinition of the range and role of philosophy. By no means the life-long combatant, distorter or victim of scholasticism as later scholarship often claims, Luther at once unfolded and redirected a tradition that stretched back through St Bonaventura to St Francis of Assisi, a tradition that rejected the Thomistic ‘Unmoved Mover’ and envisaged a covenantal ‘God who acts’. For Luther, the ‘God who acts’ became the ‘God who acts in Christ’, who is unpredictable and foils any systematic search, who contrary to ‘reason’ carries the cross from Christmas to Easter.