Participation by Christians who are not Catholic
56. The subject of participation in the Eucharist inevitably raises the question of Christians belonging to Churches or Ecclesial Communities not in full communion with the Catholic Church. In this regard, it must be said that the intrinsic link between the Eucharist and the Church's unity inspires us to long for the day when we will be able to celebrate the Holy Eucharist together with all believers in Christ, and in this way to express visibly the fullness of unity that Christ willed for his disciples (cf. Jn 17:21). On the other hand, the respect we owe to the sacrament of Christ's Body and Blood prevents us from making it a mere "means" to be used indiscriminately in order to attain that unity. (172) The Eucharist in fact not only manifests our personal communion with Jesus Christ, but also implies full communio with the Church. This is the reason why, sadly albeit not without hope, we ask Christians who are not Catholic to understand and respect our conviction, which is grounded in the Bible and Tradition.
We hold that eucharistic communion and ecclesial communion are so linked as to make it generally impossible for non-Catholic Christians to receive the former without enjoying the latter. There would be even less sense in actually concelebrating with ministers of Churches or ecclesial communities not in full communion with the Catholic Church. Yet it remains true that, for the sake of their eternal salvation, individual non-Catholic Christians can be admitted to the Eucharist, the sacrament of Reconciliation and the Anointing of the Sick. But this is possible only in specific, exceptional situations and requires that certain precisely defined conditions be met (173). These are clearly indicated in the Catechism of the Catholic Church (174) and in its Compendium (175). Everyone is obliged to observe these norms faithfully.