Dom Bernardo's 1994 letter discusses several aspects of the Eucharist. The one on Prayer and Mysticism is quoted below.
"Prayer and Mysticism
"Thanks to the celebration of the Eucharist, the Church is a praying community. It is precisely in speaking of the Eucharist that Paul says to the Corinthians: "When you meet together as ekklêsia...(1Cor.11:18).
"If prayer is entering into communion with God, we can understand why the Eucharist fosters prayer. Even more, we can say that the Eucharist was instituted to make the ecclesial community a praying body.
"The eucharistic celebration reaches its height in the words of the Lord: "Take and eat, take and drink". To take is to receive, not only to receive, but also to be received. Eucharistic prayer is communion in mutual giving and mutual receiving. In this way, the word of Jesus is accomplished "You in me and I in you" (Jn.14:20).
"The eucharistic Christ is the glorified Christ who is in full communion with the Father and the Spirit. To eat Him is to partake of the Trinitarian communion. When we pray, eating and communing, we become a dwelling of God, dwelling in God. When any one of us approaches the Eucharist with a loving faith, Jesus says: "The Father and I are One" (Jn.10:30).
""And he is forthwith gathered up to God in love through the Holy Spirit and receives God coming to him and making his abode with him, not spiritually only but corporeally also, in the mystery of the holy and life-giving body and blood of our Lord Jesus Christ." (William of St. Thierry, Meditations X:8, cf XIII:5)
"Is it too much to say that eucharistic communion is the true door by which to enter into the mystery and be mystically transformed? Can we maintain that the eucharistic mystery is the privileged place of the mystical experience? If Christ is a consuming fire, is it not normal that our hearts should burn in the obscurity of faith when the broken Bread has been shared and eaten?"