What, then, does this complex word ‘communion’ mean? Its fundamental meaning speaks of the union with God brought about by Jesus Christ, in the Holy Spirit. The opportunity for such communion is present in the Word of God and in the Sacraments. Baptism is the door and the foundation of communion in the Church. The Eucharist is the source and summit of the whole Christian life (cf. Lumen Gentium, 11). The Body of Christ in the Holy Eucharist sacramentalizes this communion, that is, it is a sign and