Luther was, fundamentally, a theologian, but a theologian for a new time.He is, probably, one of the first fruits of the «new theology» heralded by Lorenzo Valla, founded on the Scriptures and the Church Fathers, both anti-scholastic and anti-speculative. Like others in Alcalá, Paris, Salamanca, or Louvain, hedesired a «positive» and pastorally relevant theology. Luther, moreover, championed an existential theology that impacted the believer’s daily life. This perspective was driven by his discovery, during years of teaching the Pauline letters, of the true meaning of justification by faith! He found in this theological theme the core of the Christian proclamation. Subsequently, he engaged in a struggle against the «theology of glory» (scholastic and speculative theology), to emphasize the true theology revealed by God, the «theology of the cross». He was not interested in an abstract God (the God absconditus), but in the God who communicates and relates with man. That is, the pro me of Lutheran soteriology.