The Sacrament of the Eucharist is the sacrament to which all the others are ordered. The reception of all the others should be followed by it. It is the crown and consummation of the sacramental system. The sacrament of the Eucharist is not merely the consecrated species of bread and wine, which really and substantially contain the body and blood, soul and divinity of Jesus Christ and which we receive in Holy Communion: it is also the words of transubstantiation uttered by the priest, which are the vehicle of Christ's substantiative action and make physically present to its his priestly act of self-oblation. The sacrament of the Eucharist in so far as it does this thing, makes present in a sacrament, but really, the priestly action of Christ, is called the Mass. The Mass is thus the supreme sacrament in its active part, as Holy Communion is the supreme sacrament in its passive Part.