Reply Obj. 3: The sacrament of circumcision was established by command of God before the Law. Hence it cannot be called a sacrament of the Law as though it were an institution of the Law, but only as an observance included in the Law. Hence Our Lord said (John 7:20) that circumcision was "not of Moses, but of his fathers." Again, among those who worshipped God, the priesthood was in existence before the Law by human appointment, for the Law allotted the priestly dignity to the firstborn.
Reply Obj. 4: The distinction of clean from unclean animals was in vogue before the Law, not with regard to eating them, since it is written (Gen. 9:3): "Everything that moveth and liveth shall be meat for you": but only as to the offering of sacrifices because they used only certain animals for that purpose. If, however, they did make any distinction in regard to eating; it was not that it was considered illegal to eat such animals, since this was not forbidden by any law, but from dislike or custom: thus even now we see that certain foods are looked upon with disgust in some countries, while people partake of them in others. ________________________
SECOND ARTICLE [I-II, Q. 103, Art. 2]
Whether, at the Time of the Law, the Ceremonies of the Old Law Had
Any Power of Justification?
Objection 1: It would seem that the ceremonies of the Old Law had the power of justification at the time of the Law. Because expiation from sin and consecration pertains to justification. But it is written (Ex. 39:21) that the priests and their apparel were consecrated by the sprinkling of blood and the anointing of oil; and (Lev. 16:16) that, by sprinkling the blood of the calf, the priest expiated "the sanctuary from the uncleanness of the children of Israel, and from their transgressions and . . . their sins." Therefore the ceremonies of the Old Law had the power of justification.
Obj. 2: Further, that by which man pleases God pertains to justification, according to Ps. 10:8: "The Lord is just and hath loved justice." But some pleased God by means of ceremonies, according to Lev. 10:19: "How could I . . . please the Lord in the ceremonies, having a sorrowful heart?" Therefore the ceremonies of the Old Law had the power of justification.
Obj. 3: Further, things relating to the divine worship regard the soul rather than the body, according to Ps. 18:8: "The Law of the Lord is unspotted, converting souls." But the leper was cleansed by means of the ceremonies of the Old Law, as stated in Lev. 14. Much more therefore could the ceremonies of the Old Law cleanse the soul by justifying it.
On the contrary, The Apostle says (Gal. 2) [*The first words of the quotation are from 3:21: St. Thomas probably quoting from memory, substituted them for 2:21, which runs thus: 'If justice be by the Law, then Christ died in vain.']: "If there had been a law given which could justify [Vulg.: 'give life'], Christ died in vain," i.e. without cause. But this is inadmissible. Therefore the ceremonies of the Old Law did not confer justice.
I answer that, As stated above (Q. 102, A. 5, ad 4), a twofold uncleanness was distinguished in the Old Law. One was spiritual and is the uncleanness of sin. The other was corporal, which rendered a man unfit for divine worship; thus a leper, or anyone that touched carrion, was said to be unclean: and thus uncleanness was nothing but a kind of irregularity. From this uncleanness, then, the ceremonies of the Old Law had the power to cleanse: because they were ordered by the Law to be employed as remedies for the removal of the aforesaid uncleannesses which were contracted in consequence of the prescription of the Law. Hence the Apostle says (Heb. 9:13) that "the blood of goats and of oxen, and the ashes of a heifer, being sprinkled, sanctify such as are defiled, to the cleansing of the flesh." And just as this uncleanness which was washed away by such like ceremonies, affected the flesh rather than the soul, so also the ceremonies themselves are called by the Apostle shortly before (Heb. 9:10) justices of the flesh: "justices of the flesh," says he, "being laid on them until the time of correction."
On the other hand, they had no power of cleansing from uncleanness of the soul, i.e. from the uncleanness of sin. The reason of this was that at no time could there be expiation from sin, except through Christ, "Who taketh away the sins [Vulg.: 'sin'] of the world" (John 1:29). And since the mystery of Christ's Incarnation and Passion had not yet really taken place, those ceremonies of the Old Law could not really contain in themselves a power flowing from Christ already incarnate and crucified, such as the sacraments of the New Law contain. Consequently they could not cleanse from sin: thus the Apostle says (Heb. 10:4) that "it is impossible that with the blood of oxen and goats sin should be taken away"; and for this reason he calls them (Gal. 4:9) "weak and needy elements": weak indeed, because they cannot take away sin; but this weakness results from their being needy, i.e. from the fact that they do not contain grace within themselves.