Divine grace, for inward conversion in the spirit, for works of penance and for purification from sin by contrition in order that our reconciliation with God and real pardon may become possible. Hence, while the Catholic doctrine conceives of justification as an interior, organic process, Luther is beginning to take it as something exterior and mechanical, as a process which results from the pushing forward of a foreign righteousness, as if it were a curtain. He turns away from the Catholic doctrine