Objection 13: Further, whatever things are serviceable to us should be recognized as coming from God. It was therefore unbecoming that besides animals, nothing but bread, wine, oil, incense, and salt should be offered to God.
Objection 14: Further, bodily sacrifices denote the inward sacrifice of the heart, whereby man offers his soul to God. But in the inward sacrifice, the sweetness, which is denoted by honey, surpasses the pungency which salt represents; for it is written (Ecclus. 24:27): "My spirit is sweet above honey." Therefore it was unbecoming that the use of honey, and of leaven which makes bread savory, should be forbidden in a sacrifice; while the use was prescribed, of salt which is pungent, and of incense which has a bitter taste. Consequently it seems that things pertaining to the ceremonies of the sacrifices have no reasonable cause.
On the contrary, It is written (Lev. 1:13): "The priest shall offer it all and burn it all upon the altar, for a holocaust, and most sweet savor to the Lord." Now according to Wis. 7:28, "God loveth none but him that dwelleth with wisdom": whence it seems to follow that whatever is acceptable to God is wisely done. Therefore these ceremonies of the sacrifices were wisely done, as having reasonable causes.
I answer that, As stated above (A. 2), the ceremonies of the Old Law had a twofold cause, viz. a literal cause, according as they were intended for Divine worship; and a figurative or mystical cause, according as they were intended to foreshadow Christ: and on either hand the ceremonies pertaining to the sacrifices can be assigned to a fitting cause.
For, according as the ceremonies of the sacrifices were intended for the divine worship, the causes of the sacrifices can be taken in two ways. First, in so far as the sacrifice represented the directing of the mind to God, to which the offerer of the sacrifice was stimulated. Now in order to direct his mind to God aright, man must recognize that whatever he has is from God as from its first principle, and direct it to God as its last end. This was denoted in the offerings and sacrifices, by the fact that man offered some of his own belongings in honor of God, as though in recognition of his having received them from God, according to the saying of David (1 Paral. xxix, 14): "All things are Thine: and we have given Thee what we received of Thy hand." Wherefore in offering up sacrifices man made protestation that God is the first principle of the creation of all things, and their last end, to which all things must be directed. And since, for the human mind to be directed to God aright, it must recognize no first author of things other than God, nor place its end in any other; for this reason it was forbidden in the Law to offer sacrifice to any other but God, according to Ex. 22:20: "He that sacrificeth to gods, shall be put to death, save only to the Lord." Wherefore another reasonable cause may be assigned to the ceremonies of the sacrifices, from the fact that thereby men were withdrawn from offering sacrifices to idols. Hence too it is that the precepts about the sacrifices were not given to the Jewish people until after they had fallen into idolatry, by worshipping the molten calf: as though those sacrifices were instituted, that the people, being ready to offer sacrifices, might offer those sacrifices to God rather than to idols. Thus it is written (Jer. 7:22): "I spake not to your fathers and I commanded them not, in the day that I brought them out of the land of Egypt, concerning the matter of burnt-offerings and sacrifices."
Now of all the gifts which God vouchsafed to mankind after they had fallen away by sin, the chief is that He gave His Son; wherefore it is written (John 3:16): "God so loved the world, as to give His only-begotten Son; that whosoever believeth in Him, may not perish, but may have life everlasting." Consequently the chief sacrifice is that whereby Christ Himself "delivered Himself . . . to God for an odor of sweetness" (Eph. 5:2). And for this reason all the other sacrifices of the Old Law were offered up in order to foreshadow this one individual and paramount sacrifice—the imperfect forecasting the perfect. Hence the Apostle says (Heb. 10:11) that the priest of the Old Law "often" offered "the same sacrifices, which can never take away sins: but" Christ offered "one sacrifice for sins, for ever." And since the reason of the figure is taken from that which the figure represents, therefore the reasons of the figurative sacrifices of the Old Law should be taken from the true sacrifice of Christ.
Reply Obj. 1: God did not wish these sacrifices to be offered to Him on account of the things themselves that were offered, as though He stood in need of them: wherefore it is written (Isa. 1:11): "I desire not holocausts of rams, and fat of fatlings, and blood of calves and lambs and buckgoats." But, as stated above, He wished them to be offered to Him, in order to prevent idolatry; in order to signify the right ordering of man's mind to God; and in order to represent the mystery of the Redemption of man by Christ.
Reply Obj. 2: In all the respects mentioned above (ad 1), there was a suitable reason for these animals, rather than others, being offered in sacrifice to God. First, in order to prevent idolatry. Because idolaters offered all other animals to their gods, or made use of them in their sorceries: while the Egyptians (among whom the people had been dwelling) considered it abominable to slay these animals, wherefore they used not to offer them in sacrifice to their gods. Hence it is written (Ex. 8:26): "We shall sacrifice the abominations of the Egyptians to the Lord our God." For they worshipped the sheep; they reverenced the ram (because demons appeared under the form thereof); while they employed oxen for agriculture, which was reckoned by them as something sacred.
Secondly, this was suitable for the aforesaid right ordering of man's mind to God: and in two ways. First, because it is chiefly by means of these animals that human life is sustained: and moreover they are most clean, and partake of a most clean food: whereas other animals are either wild, and not deputed to ordinary use among men: or, if they be tame, they have unclean food, as pigs and geese: and nothing but what is clean should be offered to God. These birds especially were offered in sacrifice because there were plenty of them in the land of promise. Secondly, because the sacrificing of these animals represented purity of heart. Because as the gloss says on Lev. 1, "We offer a calf, when we overcome the pride of the flesh; a lamb, when we restrain our unreasonable motions; a goat, when we conquer wantonness; a turtledove, when we keep chaste; unleavened bread, when we feast on the unleavened bread of sincerity." And it is evident that the dove denotes charity and simplicity of heart.
Thirdly, it was fitting that these animals should be offered, that they might foreshadow Christ. Because, as the gloss observes, "Christ is offered in the calf, to denote the strength of the cross; in the lamb, to signify His innocence; in the ram, to foreshadow His headship; and in the goat, to signify the likeness of 'sinful flesh' [*An allusion to Col. 2:11 (Textus Receptus)]. The turtledove and dove denoted the union of the two natures"; or else the turtledove signified chastity; while the dove was a figure of charity. "The wheat-flour foreshadowed the sprinkling of believers with the water of Baptism."