The doctrine of justification is still a current issue, due to the fact it answers vital and necessary questions asked by men of all times and, particularly, by current men: what makes human being just in front of God? And, what is the salvation that Christian faith promises? The present text studies the issue of the “Joint Declaration on the Doctrine of Justification” with the aim to underline the dialogical categories “differentiated consensus” and “unity in the reconciled diversity”.