"The celebration of the Eucharist, however, cannot be the starting-point for communion; it presupposes that communion already exists, a communion which it seeks to consolidate and bring to perfection." -Pope St. John Paul II
"The gift of Christ and his Spirit which we receive in Eucharistic communion superabundantly fulfils the yearning for fraternal unity deeply rooted in the human heart; at the same time it elevates the experience of fraternity already present in our common sharing at the same Eucharistic table to a degree which far surpasses that of [...]
"The Eucharist thus appears as both the source and the summit of all evangelization, since its goal is the communion of mankind with Christ and in him with the Father and the Holy Spirit." -Pope St. John Paul II
"Nature, therefore, suggests that a sacrifice must precede a sacrament; death is the prelude to a communion. It was our sins that slew Christ on Calvary, and yet by the power of God risen from the dead and reigning gloriously in Heaven, He now becomes our life and has communion with us and we with [...]
"The Eucharist is the efficacious sign and sublime cause of that communion in the divine life and that unity of the People of God by which the Church is kept in being. It is the culmination both of God's action sanctifying the world in Christ and of the worship men offer to Christ and through [...]
"The development of peoples depends, above all, on a recognition that the human race is a single family working together in true communion, not simply a group of subjects who happen to live side by side." -Pope Benedict XVI
"Our communities, when they celebrate the Eucharist, must become ever more conscious that the sacrifice of Christ is for all, and that the Eucharist thus compels all who believe in him to become 'bread that is broken' for others, and to work for the building of a more just and fraternal world." Source: Pope [...]
"[T]he whole Church plays the role of priest and victim along with Christ, offering the Sacrifice of the Mass and itself completely offered in it. The Fathers of the Church taught this wondrous doctrine." Source: Pope Paul VI, SACROSANCTUM CONCILIUM, Constitution on the Sacred Liturgy, DECEMBER 4, 1963
"The divine Redeemer is most closely united not only with His Church, which is His Beloved Spouse, but also with each and every one of the faithful, and He ardently desires to speak with them heart to heart, especially after Holy Communion." Source: Pope Pius XII, MYSTICI CORPORIS CHRISTI, 6/29/1943. ENCYCLICAL OF POPE PIUS [...]
"The unity of the Mystical Body: the Eucharist makes the Church. Those who receive the Eucharist are united more closely to Christ. Through it Christ unites them to all the faithful in one body - the Church. Communion renews, strengthens, and deepens this incorporation into the Church, already achieved by Baptism." Source: Catechism of [...]