From the English part of the address: In our continuing catechesis on St. Paul, we now consider his teaching on our justification. Paul’s experience of the Risen Lord on the road to Damascus led him to see that it is only by faith in Christ, and not by any merit of our own, that we are made righteous before God. Our justification in Christ is thus God’s gracious gift, revealed in the mystery of the Cross. Christ died in order to become our wisdom, righteousness, sanctification and redemption (cf. 1 Cor 1:30), and we in turn, justified by faith, have become in him the very righteousness of God (cf. 2 Cor 5:21). In the light of the Cross and its gifts of reconciliation and new life in the Spirit, Paul rejected a righteousness based on the Law and its works.
For the Apostle, the Mosaic Law, as an irrevocable gift of God to Israel, is not abrogated but relativized, since it is only by faith in God’s promises to Abraham, now fulfilled in Christ, that we receive the grace of justification and new life. The Law finds its end in Christ (cf. Rom 10:4) and its fulfilment in the new commandment of love. With Paul, then, let us make the Cross of Christ our only boast (cf. Gal 6:14), and give thanks for the grace which has made us members of Christ’s Body, which is the Church.
In the longer, Italian portion:
On the journey we have undertaken under the guidance of St. Paul, we now wish to reflect on a topic that is at the center of the controversies of the century of the Reformation: the issue of justification. How is a man just in the eyes of God? When Paul met the Risen One on the road to Damascus he was a fulfilled man: irreproachable in regard to justice derived from the law (cf. Philippians 3:6); he surpassed many of his contemporaries in the observance of the Mosaic prescriptions and was zealous in upholding the traditions of his forefathers (cf. Galatians 1:14). . .
The wall -- so says the Letter to the Ephesians -- between Israel and the pagans was no longer necessary: It is Christ who protects us against polytheism and all its deviations; it is Christ who unites us with and in the one God; it is Christ who guarantees our true identity in the diversity of cultures; and it is he who makes us just. To be just means simply to be with Christ and in Christ. And this suffices. Other observances are no longer necessary.
That is why Luther's expression "sola fide" is true if faith is not opposed to charity, to love. Faith is to look at Christ, to entrust oneself to Christ, to be united to Christ, to be conformed to Christ, to his life. And the form, the life of Christ, is love; hence, to believe is to be conformed to Christ and to enter into his love. That is why, in the Letter to the Galatians, St. Paul develops above all his doctrine on justification; he speaks of faith that operates through charity (cf. Galatians 5:14).