The Eucharistic Assembly:
Heart of Sunday
The presence of the Risen Lord
31. "I am with you always, to the end of the age" (Mt 28:20). This promise of Christ never ceases to resound in the Church as the fertile secret of her life and the wellspring of her hope. As the day of Resurrection, Sunday is not only the remembrance of a past event: it is a celebration of the living presence of the Risen Lord in the midst of his own people.
For this presence to be properly proclaimed and lived, it is not enough that the disciples of Christ pray individually and commemorate the death and Resurrection of Christ inwardly, in the secrecy of their hearts. Those who have received the grace of baptism are not saved as individuals alone, but as members of the Mystical Body, having become part of the People of God.(38) It is important therefore that they come together to express fully the very identity of the Church, the ekklesia, the assembly called together by the Risen Lord who offered his life "to reunite the scattered children of God" (Jn 11:52).
They have become "one" in Christ (cf. Gal 3:28) through the gift of the Spirit. This unity becomes visible when Christians gather together: it is then that they come to know vividly and to testify to the world that they are the people redeemed, drawn "from every tribe and language and people and nation" (Rev 5:9). The assembly of Christ's disciples embodies from age to age the image of the first Christian community which Luke gives as an example in the Acts of the Apostles, when he recounts that the first baptized believers "devoted themselves to the apostles' teaching and fellowship, to the breaking of bread and the prayers" (2:42).