Lutheran doctrine and the consolidation of the Reformation in the Empire

The theological core of Lutheran doctrine rests on the "solas": "sola fide" holds that believers are justified before God through faith in Christ alone, not through meritorious works; "sola gratia" holds that salvation is an unearned gift of divine grace; "sola scriptura" establishes the Bible as the sole, final authority in matters of faith, above ecclesiastical tradition; and "solus Christus" affirms Christ as the only mediator between God and humanity. Luther reduced the sacraments from the traditional seven to two, baptism and the Eucharist, retained belief in Christ's real presence through "consubstantiation," and rejected purgatory as lacking scriptural foundation, thereby undercutting the theological basis for indulgences. He also developed the doctrine of "two kingdoms," distinguishing God's spiritual governance over conscience from the temporal governance of civil rulers.