Reply Obj. 3: Some of the sacraments of the New Law had corresponding figurative sacraments in the Old Law. For Baptism, which is the sacrament of Faith, corresponds to circumcision. Hence it is written (Col. 2:11, 12): "You are circumcised . . . in the circumcision of" Our Lord Jesus "Christ: buried with Him in Baptism." In the New Law the sacrament of the Eucharist corresponds to the banquet of the paschal lamb. The sacrament of Penance in the New Law corresponds to all the purifications of the Old Law. The sacrament of Orders corresponds to the consecration of the pontiff and of the priests. To the sacrament of Confirmation, which is the sacrament of the fulness of grace, there would be no corresponding sacrament of the Old Law, because the time of fulness had not yet come, since "the Law brought no man [Vulg.: 'nothing'] to perfection" (Heb. 7:19). The same applies to the sacrament of Extreme Unction, which is an immediate preparation for entrance into glory, to which the way was not yet opened out in the Old Law, since the price had not yet been paid. Matrimony did indeed exist under the Old Law, as a function of nature, but not as the sacrament of the union of Christ with the Church, for that union was not as yet brought about. Hence under the Old Law it was allowable to give a bill of divorce, which is contrary to the nature of the sacrament.

Reply Obj. 4: As already stated, the purifications of the Old Law were ordained for the removal of impediments to the divine worship: which worship is twofold; viz. spiritual, consisting in devotion of the mind to God; and corporal, consisting in sacrifices, oblations, and so forth. Now men are hindered in the spiritual worship by sins, whereby men were said to be polluted, for instance, by idolatry, murder, adultery, or incest. From such pollutions men were purified by certain sacrifices, offered either for the whole community in general, or also for the sins of individuals; not that those carnal sacrifices had of themselves the power of expiating sin; but that they signified that expiation of sins which was to be effected by Christ, and of which those of old became partakers by protesting their faith in the Redeemer, while taking part in the figurative sacrifices.

The impediments to external worship consisted in certain bodily uncleannesses; which were considered in the first place as existing in man, and consequently in other animals also, and in man's clothes, dwelling-place, and vessels. In man himself uncleanness was considered as arising partly from himself and partly from contact with unclean things. Anything proceeding from man was reputed unclean that was already subject to corruption, or exposed thereto: and consequently since death is a kind of corruption, the human corpse was considered unclean. In like manner, since leprosy arises from corruption of the humors, which break out externally and infect other persons, therefore were lepers also considered unclean; and, again, women suffering from a flow of blood, whether from weakness, or from nature (either at the monthly course or at the time of conception); and, for the same reason, men were reputed unclean if they suffered from a flow of seed, whether due to weakness, to nocturnal pollution, or to sexual intercourse. Because every humor issuing from man in the aforesaid ways involves some unclean infection. Again, man contracted uncleanness by touching any unclean thing whatever.

Now there was both a literal and a figurative reason for these uncleannesses. The literal reason was taken from the reverence due to those things that belong to the divine worship: both because men are not wont, when unclean, to touch precious things: and in order that by rarely approaching sacred things they might have greater respect for them. For since man could seldom avoid all the aforesaid uncleannesses, the result was that men could seldom approach to touch things belonging to the worship of God, so that when they did approach, they did so with greater reverence and humility. Moreover, in some of these the literal reason was that men should not be kept away from worshipping God through fear of coming in contact with lepers and others similarly afflicted with loathsome and contagious diseases. In others, again, the reason was to avoid idolatrous worship: because in their sacrificial rites the Gentiles sometimes employed human blood and seed. All these bodily uncleannesses were purified either by the mere sprinkling of water, or, in the case of those which were more grievous, by some sacrifice of expiation for the sin which was the occasion of the uncleanness in question.

The figurative reason for these uncleannesses was that they were figures of various sins. For the uncleanness of any corpse signifies the uncleanness of sin, which is the death of the soul. The uncleanness of leprosy betokened the uncleanness of heretical doctrine: both because heretical doctrine is contagious just as leprosy is, and because no doctrine is so false as not to have some truth mingled with error, just as on the surface of a leprous body one may distinguish the healthy parts from those that are infected. The uncleanness of a woman suffering from a flow of blood denotes the uncleanness of idolatry, on account of the blood which is offered up. The uncleanness of the man who has suffered seminal loss signifies the uncleanness of empty words, for "the seed is the word of God." The uncleanness of sexual intercourse and of the woman in child-birth signifies the uncleanness of original sin. The uncleanness of the woman in her periods signifies the uncleanness of a mind that is sensualized by pleasure. Speaking generally, the uncleanness contracted by touching an unclean thing denotes the uncleanness arising from consent in another's sin, according to 2 Cor. 6:17: "Go out from among them, and be ye separate . . . and touch not the unclean thing."

Moreover, this uncleanness arising from the touch was contracted even by inanimate objects; for whatever was touched in any way by an unclean man, became itself unclean. Wherein the Law attenuated the superstition of the Gentiles, who held that uncleanness was contracted not only by touch, but also by speech or looks, as Rabbi Moses states (Doct. Perplex. iii) of a woman in her periods. The mystical sense of this was that "to God the wicked and his wickedness are hateful alike" (Wis. 14:9).

There was also an uncleanness of inanimate things considered in themselves, such as the uncleanness of leprosy in a house or in clothes. For just as leprosy occurs in men through a corrupt humor causing putrefaction and corruption in the flesh; so, too, through some corruption and excess of humidity or dryness, there arises sometimes a kind of corruption in the stones with which a house is built, or in clothes. Hence the Law called this corruption by the name of leprosy, whereby a house or a garment was deemed to be unclean: both because all corruption savored of uncleanness, as stated above, and because the Gentiles worshipped their household gods as a preservative against this corruption. Hence the Law prescribed such houses, where this kind of corruption was of a lasting nature, to be destroyed; and such garments to be burnt, in order to avoid all occasion of idolatry. There was also an uncleanness of vessels, of which it is written (Num. 19:15): "The vessel that hath no cover, and binding over it, shall be unclean." The cause of this uncleanness was that anything unclean might easily drop into such vessels, so as to render them unclean. Moreover, this command aimed at the prevention of idolatry. For idolaters believed that if mice, lizards, or the like, which they used to sacrifice to the idols, fell into the vessels or into the water, these became more pleasing to the gods. Even now some women let down uncovered vessels in honor of the nocturnal deities which they call "Janae."

The figurative reason of these uncleannesses is that the leprosy of a house signified the uncleanness of the assembly of heretics; the leprosy of a linen garment signified an evil life arising from bitterness of mind; the leprosy of a woolen garment denoted the wickedness of flatterers; leprosy in the warp signified the vices of the soul; leprosy on the woof denoted sins of the flesh, for as the warp is in the woof, so is the soul in the body. The vessel that has neither cover nor binding, betokens a man who lacks the veil of taciturnity, and who is unrestrained by any severity of discipline.

Reply Obj. 5: As stated above (ad 4), there was a twofold uncleanness in the Law; one by way of corruption in the mind or in the body; and this was the graver uncleanness; the other was by mere contact with an unclean thing, and this was less grave, and was more easily expiated. Because the former uncleanness was expiated by sacrifices for sins, since all corruption is due to sin, and signifies sin: whereas the latter uncleanness was expiated by the mere sprinkling of a certain water, of which water we read in Num. 19. For there God commanded them to take a red cow in memory of the sin they had committed in worshipping a calf. And a cow is mentioned rather than a calf, because it was thus that the Lord was wont to designate the synagogue, according to Osee 4:16: "Israel hath gone astray like a wanton heifer": and this was, perhaps, because they worshipped heifers after the custom of Egypt, according to Osee 10:5: "(They) have worshipped the kine of Bethaven." And in detestation of the sin of idolatry it was sacrificed outside the camp; in fact, whenever sacrifice was offered up in expiation of the multitude of sins, it was all burnt outside the camp. Moreover, in order to show that this sacrifice cleansed the people from all their sins, "the priest" dipped "his finger in her blood," and sprinkled "it over against the door of the tabernacle seven times"; for the number seven signified universality. Further, the very sprinkling of blood pertained to the detestation of idolatry, in which the blood that was offered up was not poured out, but was collected together, and men gathered round it to eat in honor of the idols. Likewise it was burnt by fire, either because God appeared to Moses in a fire, and the Law was given from the midst of fire; or to denote that idolatry, together with all that was connected therewith, was to be extirpated altogether; just as the cow was burnt "with her skin and her flesh, her blood and dung being delivered to the flames." To this burning were added "cedar-wood, and hyssop, and scarlet twice dyed," to signify that just as cedar-wood is not liable to putrefaction, and scarlet twice dyed does not easily lose its color, and hyssop retains its odor after it has been dried; so also was this sacrifice for the preservation of the whole people, and for their good behavior and devotion. Hence it is said of the ashes of the cow: "That they may be reserved for the multitude of the children of Israel." Or, according to Josephus (Antiq. iii, 8, 9, 10), the four elements are indicated here: for "cedar-wood" was added to the fire, to signify the earth, on account of its earthiness; "hyssop," to signify the air, on account of its smell; "scarlet twice dyed," to signify water, for the same reason as purple, on account of the dyes which are taken out of the water: thus denoting the fact that this sacrifice was offered to the Creator of the four elements. And since this sacrifice was offered for the sin of idolatry, both "he that burned her," and "he that gathered up the ashes," and "he that sprinkled the water" in which the ashes were placed, were deemed unclean in detestation of that sin, in order to show that whatever was in any way connected with idolatry should be cast aside as being unclean. From this uncleanness they were purified by the mere washing of their clothes; nor did they need to be sprinkled with the water on account of this kind of uncleanness, because otherwise the process would have been unending, since he that sprinkled the water became unclean, so that if he were to sprinkle himself he would remain unclean; and if another were to sprinkle him, that one would have become unclean, and in like manner, whoever might sprinkle him, and so on indefinitely.

The figurative reason of this sacrifice was that the red cow signified Christ in respect of his assumed weakness, denoted by the female sex; while the color of the cow designated the blood of His Passion. And the "red cow was of full age," because all Christ's works are perfect, "in which there" was "no blemish"; "and which" had "not carried the yoke," because Christ was innocent, nor did He carry the yoke of sin. It was commanded to be taken to Moses, because they blamed Him for transgressing the law of Moses by breaking the Sabbath. And it was commanded to be delivered "to Eleazar the priest," because Christ was delivered into the hands of the priests to be slain. It was immolated "without the camp," because Christ "suffered outside the gate" (Heb. 13:12). And the priest dipped "his finger in her blood," because the mystery of Christ's Passion should be considered and imitated.