In regard to the whole community, man is perfected in two ways. First, by receiving power to rule the community and to exercise public acts: and corresponding to this in the spiritual life there is the sacrament of order, according to the saying of Heb. 7:27, that priests offer sacrifices not for themselves only, but also for the people. Secondly in regard to natural propagation. This is accomplished by Matrimony both in the corporal and in the spiritual life: since it is not only a sacrament but also a function of nature.
We may likewise gather the number of the sacraments from their being instituted as a remedy against the defect caused by sin. For Baptism is intended as a remedy against the absence of spiritual life; Confirmation, against the infirmity of soul found in those of recent birth; the Eucharist, against the soul's proneness to sin; Penance, against actual sin committed after baptism; Extreme Unction, against the remainders of sins—of those sins, namely, which are not sufficiently removed by Penance, whether through negligence or through ignorance; order, against divisions in the community; Matrimony, as a remedy against concupiscence in the individual, and against the decrease in numbers that results from death.
Some, again, gather the number of sacraments from a certain adaptation to the virtues and to the defects and penal effects resulting from sin. They say that Baptism corresponds to Faith, and is ordained as a remedy against original sin; Extreme Unction, to Hope, being ordained against venial sin; the Eucharist, to Charity, being ordained against the penal effect which is malice; Order, to Prudence, being ordained against ignorance; Penance to Justice, being ordained against mortal sin; Matrimony, to Temperance, being ordained against concupiscence; Confirmation, to Fortitude, being ordained against infirmity.
Reply Obj. 1: The same principal agent uses various instruments unto various effects, in accordance with the thing to be done. In the same way the Divine power and the Passion of Christ work in us through the various sacraments as through various instruments.
Reply Obj. 2: Guilt and punishment are diversified both according to species, inasmuch as there are various species of guilt and punishment, and according to men's various states and habitudes. And in this respect it was necessary to have a number of sacraments, as explained above.
Reply Obj. 3: In hierarchical actions we must consider the agents, the recipients and the actions. The agents are the ministers of the Church; and to these the sacrament of order belongs. The recipients are those who approach the sacraments: and these are brought into being by Matrimony. The actions are "cleansing," "enlightening," and "perfecting." Mere cleansing, however, cannot be a sacrament of the New Law, which confers grace: yet it belongs to certain sacramentals, i.e. catechism and exorcism. But cleansing coupled with enlightening, according to Dionysius, belongs to Baptism; and, for him who falls back into sin, they belong secondarily to Penance and Extreme Unction. And perfecting, as regards power, which is, as it were, a formal perfection, belongs to Confirmation: while, as regards the attainment of the end, it belongs to the Eucharist.
Reply Obj. 4: In the sacrament of Confirmation we receive the fulness of the Holy Ghost in order to be strengthened; while in Extreme Unction man is prepared for the immediate attainment of glory; and neither of these two purposes was becoming to the Old Testament. Consequently, nothing in the old Law could correspond to these sacraments. Nevertheless, the sacraments of the old Law were more numerous, on account of the various kinds of sacrifices and ceremonies.
Reply Obj. 5: There was need for a special sacrament to be applied as a remedy against venereal concupiscence: first because by this concupiscence, not only the person but also the nature is defiled: secondly, by reason of its vehemence whereby it clouds the reason.
Reply Obj. 6: Holy Water and other consecrated things are not called sacraments, because they do not produce the sacramental effect, which is the receiving of grace. They are, however, a kind of disposition to the sacraments: either by removing obstacles, thus holy water is ordained against the snares of the demons, and against venial sins: or by making things suitable for the conferring of a sacrament; thus the altar and vessels are consecrated through reverence for the Eucharist.
Reply Obj. 7: Oblations and tithes, both the Law of nature and in the Law of Moses, ere ordained not only for the sustenance of the ministers and the poor, but also figuratively; and consequently they were sacraments. But now they remain no longer as figures, and therefore they are not sacraments.