It’s natural to ask how the idea of community in the Didache pertains to Christians in our 21st century Church; the idea is very much rooted in Catholic “Body of Christ” Theology. The Catechism of the Catholic Church explains this in section 787-789:
II. The Church—Body of Christ
The Church is communion with Jesus
787 From the beginning, Jesus associated his disciples with his own life, revealed the mystery of the Kingdom to them, and gave them a share in his mission, joy, and sufferings. Jesus spoke of a still more intimate communion between him and those who would follow him: “Abide in me, and I in you.… I am the vine, you are the branches.”216 And he proclaimed a mysterious and real communion between his own body and ours: “He who eats my flesh and drinks my blood abides in me, and I in him.” (755)
788 When his visible presence was taken from them, Jesus did not leave his disciples orphans. He promised to remain with them until the end of time; he sent them his Spirit. As a result communion with Jesus has become, in a way, more intense: “By communicating his Spirit, Christ mystically constitutes as his body those brothers of his who are called together from every nation.”219 (690)
789 The comparison of the Church with the body casts light on the intimate bond between Christ and his Church. Not only is she gathered around him; she is united in him, in his body. Three aspects of the Church as the Body of Christ are to be more specifically noted: the unity of all her members with each other as a result of their union with Christ; Christ as head of the Body; and the Church as bride of Christ.
Recently, I’ve read the Spiritual Diary of St. John Paul II; published for the first time in English. The future Saint wrote about the importance of Christian community in 1978 in his notes, “’Koinonia,’ the community, is the third principle dimension of Christian existence.” John Paul II would return to this theme many times in his diaries and in 1984 wrote reminding us now the dangers of living as an individual in our contemporary society that “Humankind threatened by ‘deindividuation! Contemporary Man. Christianity couters this with the reality of ‘communio’ the communion with God through Jesus Christ, through the mystery of incarnation; the communion of saints.”
Naturally, this is why I have sought to call all of us here together, I desire to foster this community amongst ourselves, but there’s even more that we can do build our community. We need to follow Christ. Remember, the Apostles asked Jesus, “Where are you staying?” He replied, “Come and See.” (John 1:38-41) We encounter Jesus at every Mass during the Liturgy of the Eucharist in our community, we become a part of the Body of Christ during our baptism, but we grow even closer to him by partaking of His body in the Eucharist. As such we use the same language during the mass, we call our celebration of the Eucharist “communion” and before receiving the sacred Body, it is held up the words “The Body of Christ” are spoken prior to reception.
 Catholic Church, Catechism of the Catholic Church, 2nd Ed. (Washington: United States Catholic Conference, 2000), 208.
 Pope St. John Paul II In God’s Hands: The Spiritual Diaries of Pope Saint John Paul II (London: Harper One, 2017), 134.
 Ibid, 229.