Article one lays out how the Christian traditions distribute sanctification and justification differently. The sharpest of those differences was not merely argued informally; it was fixed by conciliar decree on one side and, more than four centuries later, substantially eased by joint declaration.
The Council of Trent's Decree on Justification (1547) responded directly to the Reformation by affirming that justification itself includes a real, inherent transformation of the sinner rather than only an external, forensic declaration, and its accompanying canons anathematise the position that faith alone, without works flowing from inherent righteousness, suffices for justification. That conciliar act gave the Catholic and Reformation positions the sharp, mutually anathematising edges article one describes, and for over four hundred years the dispute was treated by both sides as dividing the essential meaning of the gospel itself.
The Joint Declaration on the Doctrine of Justification, signed by the Lutheran World Federation and the Catholic Church in 1999 and later joined by Methodist and Reformed bodies, states that the two sides' remaining differences in language and emphasis are compatible with a shared basic understanding, and that the sixteenth-century condemnations, read in that light, do not apply to the other side's actual teaching as now presented. The declaration does not erase the historic disagreement; it reclassifies it as a difference the two traditions can live with rather than one requiring mutual condemnation, a rare instance of a centuries-old doctrinal division being formally, if partially, resolved rather than merely outlived.