"'Faith is now sharply defined by this situation: faith is openness to and acknowledgement of Christ's authority in its concrete sacramental exercise. There is no other prerequisite than faith for the fruitful reception of the sacrament, because the sacrament is itself the public act in which Christ bestows his grace on the ungodly. The public sacramental life of the Church is now seen as the locus of assurance, of certitude, the place where an entirely unidialectical salvific communication takes place.' In sum, justification is Christology."
(Richard John Neuhaus citing David Yeago's description of Luther's understanding of justification by faith in the essay "Luther, Newman, and the Punctiliar Church" in "All Theology is Christology: Essays in Honor of David P. Scaer", p. 156)