Catechesis: the Eucharist

So, there is a twofold eating of Christ’s flesh. First, there is a spiritual kind of eating, Christ treats above all in John 6. This occurs in no other way than with the Spirit and faith in the proclamation of and meditation on the gospel, as well as in the Supper. It is in and of itself useful, salutary, and necessary for all Christians at all times for their salvation. Without this spiritual reception, even the sacramental or oral eating in the Supper is not only not salutary, but also harmful and damning.—FC SD VII:61.