That “peace and communion” is celebrated and made manifest in the ritual of Mass. It is celebrated and made manifest as we participate in the whole action of the Mass, and become one as we receive the Body and Blood of Christ, but it is also specified in the Kiss of Peace. This is why the Kiss of Peace should remain a formal liturgical act, and not just an opportunity to say “Good morning” and give everyone a hug and ask where they’re going to eat Sunday dinner. When we celebrate Christ’s peace we participate and affirm the profound reality of genuine peace and mutual charity that exists at the foundation of our shared faith.
This ancient practice survives today when the priest breaks the consecrated host, and immediately places a small part of it into the chalice. When he does so, he ritually recognizes that although we are separate from the whole body of Christ, by time, by geography, by death and sometimes by human disagreements and strife, still there is an underlying unity in the Body of Christ.
What is vital to remember is that the more we, as individuals, submit to the simple teachings of the church, the more we grow together in unity. The more we push our own agendas, disagree, pick fights with others and ‘un-church’ others, the more we sin against unity, and in so doing, sin against the Body of Christ.
These thoughts are gleaned from my reading of Mgr. Guissani’s The Journey to the Truth is an Experience.