The unity of the Church obviously can’t come from not being divided into subgroups. There are dioceses, parishes, separate masses in parishes, etc. How are we united, then? In faith and obedience. If people who have abandoned the faith or lived a very lukewarm Catholicism are brought back to live a life of faith, obedience to the teaching of the Church (for example, obeying Humanae Vitae, and stuff like that) and apostolic zeal, this can only increase the unity of the Church, even if they attend a different mass of the parish. Can you see it now?
No, i do not. Unity is unity in all observances, unity in one Catechism, and Unity in one Hierarchy. Not a bunch of differing groups with differing ideologies who operate independent of the whole. The Protestants have been trying this for several centuries and it does not seem to be going so well for them. This division is setting the framework for further breaks in The Body of Christ.
“[21] That they all may be
one, as thou, Father, in me, and I in thee; that they also may be one in us; that the world may believe that thou hast sent me. [22] And the glory which thou hast given me, I have given to them; that they may be one, as we also are one: [23] I in them, and thou in me; that they may be made perfect in one: and the world may know that thou hast sent me, and hast loved them, as thou hast also loved me.”
Gospel of St. John 17
From H.H. Pope Leo XIII, Satis Cognitum
“1. It is sufficiently well known unto you that no small share of Our thoughts and of Our care is devoted to Our endeavour to bring back to the fold, placed under the guardianship of Jesus Christ, the Chief Pastor of souls, sheep that have strayed. Bent upon this, We have thought it most conducive to this salutary end and purpose to describe the exemplar and, as it were, the lineaments of the Church.
Amongst these the most worthy of Our chief consideration is Unity. This the Divine Author impressed on it as a lasting sign of truth and of unconquerable strength. The essential beauty and comeliness of the Church ought greatly to influence the minds of those who consider it. Nor is it improbable that ignorance may be dispelled by the consideration; that false ideas and prejudices may be dissipated from the minds chiefly of those who find themselves in error without fault of theirs; and that even a love for the Church may be stirred up in the souls of men, like unto that charity wherewith Christ loved and united himself to that spouse redeemed by His precious blood. “Christ loved the Church, and delivered Himself up for it” (Eph. v., 25).”
Read the Encyclical here:
papalencyclicals.net/Leo13/l13satis.htm