"The Eucharistic Mystery is truly the centre of the liturgy and indeed of the whole Christian life. Consequently the Church, guided by the Holy Spirit, continually seeks to understand this mystery more fully and more and more to derive its life from it".
(Instruction 1967, "Eucharisticum mysterium", on worship of the Eucharist, n. 1)

"In order to direct and to encourage devotion to the sacrament of the Eucharist correctly, the Eucharistic Mystery must be considered in all its fullness, both in the celebration of Mass and in the worship of the sacrament which is reserved after Mass to extend the grace of the sacrifice."
(Roman Ritual, 1973, "Eucharistic worship outside Mass", n. 4)

"However, no Christian community is built up which does not grow from and hinge on the celebration of the most holy Eucharist. From this all education for community spirit must begin. This eucharistic celebration, to be full and sincere, ought to lead on the one hand to the various works of charity and mutual help, and on the other hand to missionary activity and the various forms of Christian witness."
(Vatican Council II. "Ministry and life of priests", n. 6)

"All of us who take part in the Eucharist are called to discover, through this Sacrament, the profound meaning of our actions in the world in favour of development and peace; and to receive from it the strength to commit ourselves ever more generously, following the example of Christ, who in this Sacrament lays down his life for his friends (cf. Jn 15: 13). Our personal commitment, like Christ's and in union with his, will not be in vain but certainly fruitful".
(John Paul II, Encyclical 1987 "Sollicitudo rei socialis", n. 48)