At the last supper, with his apostles, Jesus bequeaths to all humanity the memorial celebration of his Redeeming Passover. The Church, from its beginnings, feels a truly heir to this legacy, keeping alive, uninterruptedly, the fulfillment of the Lord s iteration order: do this in memory of me. The celebration of the Eucharist constitutes the central nucleus of the Church s Liturgy, around which all her moments of prayer revolve. Furthermore, through the action of the Holy Spirit, in the Liturgy, the Church is constituted and manifests itself. In all of this, the Holy Spirit occupies a central role, which cannot, in any way, be relativized or forgotten. These facts emphasize how seriously the Church is called to grow ever more in the understanding of the Mystery of Christ, and in his mission to lead the christians to a participation more active and conscious. This work intends to carry out a study of the prayer formulas used to celebrate the Eucharist, highlighting the action of the Holy Spirit and its ecclesiogenetic dynamics in the liturgical action. The methodology of the research is predominantly mystagogical. The liturgy texts will be courted prominently, as an authoritative voice to teach. When performing a mystagogy of the Eucharist, the dynamics of the Divine Pneuma and the generation of the Church will be highlighted, in order to make an authentic pneumatological-mystagogic study, in other terms, a pneumatology that manifests itself as an ecclesiogenetic epicletology.