But one must not forget the primary office of priests, who have been consecrated by their ordination to represent Christ the Priest: for this reason their hands, like their words and their will, have become the direct instruments of Christ. Through this fact, that is, as ministers of the Holy Eucharist, they have a primary responsibility for the sacred species, because it is a total responsibility: they offer the bread and wine, they consecrate it, and then distribute the sacred species to the participants in the assembly who wish to receive them. Deacons can only bring to the altar the offerings of the faithful and, once they have been consecrated by the priest, distribute them. How eloquent therefore, even if not of ancient custom, is the rite of the anointing of the hands in our Latin ordination, as though precisely for these hands a special grace and power of the Holy Spirit is necessary!
To touch the sacred species and to distribute them with their own hands is a privilege of the ordained, one which indicates an active participation in the ministry of the Eucharist. It is obvious that the Church can grant this faculty to those who are neither priests nor deacons, as is the case with acolytes in the exercise of their ministry, especially if they are destined for future ordination, or with other lay people who are chosen for this to meet a just need, but always after an adequate preparation. (emphasis added)