This study focuses on the dynamic functions of the Holy spirit together with the Father and the son in realizing the sacrament of the Eucarist. It illustrates how the entire liturgical celebration is both epicletic and anamnetic as it prolongs the self-communication of the Son at the Last Supper and that of the Holy spirit at Pentecost. It explains how Jesus’ words of institution are conjoined to the epiclesis of the Holy Spirit, both together forming a single ...