5 Therefore we earnestly exhort your faithful, although of various regions and tongues, to preserve that far more excellent kinship which is born from the communion of faith and common sacraments. For whoever are baptized in Christ, have one Lord and one faith; they are one body and one spirit, insofar as they are called to one hope. It would be truly disgraceful that those who are bound together by so many holy ties and are seeking the same city in heaven should be torn apart by earthly reasons, rivaling with one another, as the Apostle says, and hating one another. Therefore, that kinship of souls which comes from Christ must constantly be inculcated in the faithful and all partiality must be eradicated. "For greater indeed is the paternity of Christ than that of blood: for the fraternity of blood touches the likeness only of the body; the fraternity of Christ, however, conveys unanimity of heart and spirit, as is written: One was the heart and one the spirit of the multitude of believers."(1)
Source: Reputantibus (Vatican.va)