The Institution of the Eucharist
From the beginning, the Church solemnly fulfills the Lord’s actions, coming to understand them by meditating on them one by one, as if to be instructed over and over again in their meaning: the presentation of the Gifts, the consecration, the breaking of the bread and the distribution of Holy Communion.
[138] For this reason, the words “Take and eat” are not followed by the breaking of the host. If this be done, that moment would immediately become communion. Instead, at this
highly charged mystical moment, the liturgy indicates that the celebrant is to
bow his head and pronounce the words with a clear, moderate voice so as to promote contemplation, as does the Bishop on Holy Thursday, when he breathes over the Oil of Chrism. “By his actions and by his proclamation of the words, he (the celebrant) should impress upon the faithful the living presence of Christ.”
[139] At this moment, indeed, the sacramental Sacrifice is accomplished.