Reply to Objection 1: The precept about hallowing the Sabbath, understood literally, is partly oral and partly ceremonial. It is a moral precept in the point of commanding man to aside a certain time to be given to Divine things. For there is in man a natural inclination to set aside a certain time for each necessary thing, such as refreshment of the body, sleep, and so forth. Hence according to the dictate of reason, man sets aside a certain time for spiritual refreshment, by which man's mind is refreshed in God. And thus to have a certain time set aside for occupying oneself with Divine things is the matter of a moral precept. But, in so far as this precept specializes the time as a sign representing the Creation of the world, it is a ceremonial precept. Again, it is a ceremonial precept in its allegorical signification, as representative of Christ's rest in the tomb on the seventh day: also in its moral signification, as representing cessation from all sinful acts, and the mind's rest in God, in which sense, too, it is a general precept. Again, it is a ceremonial precept in its analogical signification, as foreshadowing the enjoyment of God in heaven. Hence the precept about hallowing the Sabbath is placed among the precepts of the decalogue, as a moral, but not as a ceremonial precept.
Reply to Objection 2: The other ceremonies of the Law are signs of certain particular Divine works: but the observance of the Sabbath is representative of a general boon, namely, the production of all creatures. Hence it was fitting that it should be placed among the general precepts of the decalogue, rather than any other ceremonial precept of the Law.
Reply to Objection 3: Two things are to be observed in the hallowing of the Sabbath. One of these is the end: and this is that man occupy himself with Divine things, and is signified in the words: "Remember that thou keep holy the Sabbath day." For in the Law those things are said to be holy which are applied to the Divine worship. The other thing is cessation from work, and is signified in the words ( Ex. 20:11 ), "On the seventh day . . . thou shalt do no work." The kind of work meant appears from Lev. 23:3, "You shall do no servile work on that day [*Vulg.: 'You shall do no work on that day']." Now servile work is so called from servitude: and servitude is threefold. One, whereby man is the servant of sin, according to Jn. 8:34, "Whosoever committeth sin is the servant of sin," and in this sense all sinful acts are servile. Another servitude is whereby one man serves another. Now one man serves another not with his mind but with his body, as stated above (Q[104], AA[5],6, ad 1). Wherefore in this respect those works are called servile whereby one man serves another. The third is the servitude of God; and in this way the work of worship, which pertains to the service of God, may be called a servile work. In this sense servile work is not forbidden on the Sabbath day, because that would be contrary to the end of the Sabbath observance: since man abstains from other works on the Sabbath day in order that he may occupy himself with works connected with God's service. For this reason, according to Jn. 7:23, "a man [*Vulg.: 'If a man,' etc.] receives circumcision on the Sabbath day, that the law of Moses may not be broken": and for this reason too we read ( Mat. 12:5 ), that "on the Sabbath days the priests in the temple break the Sabbath," i.e. do corporal works on the Sabbath, "and are without blame." Accordingly, the priests in carrying the ark on the Sabbath did not break the precept of the Sabbath observance. In like manner it is not contrary to the observance of the Sabbath to exercise any spiritual act, such as teaching by word or writing. Wherefore a gloss on Num 28 says that "smiths and like craftsmen rest on the Sabbath day, but the reader or teacher of the Divine law does not cease from his work. Yet he profanes not the Sabbath, even as the priests in the temple break the Sabbath, and are without blame." On the other hand, those works that are called servile in the first or second way are contrary to the observance of the Sabbath, in so far as they hinder man from applying himself to Divine things. And since man is hindered from applying himself to Divine things rather by sinful than by lawful albeit corporal works, it follows that to sin on a feast day is more against this precept than to do some other but lawful bodily work. Hence Augustine says (De decem chord. iii): "It would be better if the Jew did some useful work on his farm than spent his time seditiously in the theatre: and their womenfolk would do better to be making linen on the Sabbath than to be dancing lewdly all day in their feasts of the new moon." It is not, however, against this precept to sin venially on the Sabbath, because venial sin does not destroy holiness.
Again, corporal works, not pertaining to the spiritual worship of God, are said to be servile in so far as they belong properly to servants; while they are not said to be servile, in so far as they are common to those who serve and those who are free. Moreover, everyone, be he servant or free, is bound to provide necessaries both for himself and for his neighbor, chiefly in respect of things pertaining to the well-being of the body, according to Prov. 24:11, "Deliver them that are led to death": secondarily as regards avoiding damage to one's property, according to Dt. 22:1, "Thou shalt not pass by if thou seest thy brother's ox or his sheep go astray, but thou shalt bring them back to thy brother." Hence a corporal work pertaining to the preservation of one's own bodily well-being does not profane the Sabbath: for it is not against the observance of the Sabbath to eat and do such things as preserve the health of the body. For this reason the Machabees did not profane the Sabbath when they fought in self-defense on the Sabbath day ( 1 Macc. 2 ), nor Elias when he fled from the face of Jezabel on the Sabbath. For this same reason our Lord ( Mat. 12:3 ) excused His disciples for plucking the ears of corn on account of the need which they suffered. In like manner a bodily work that is directed to the bodily well-being of another is not contrary to the observance of the Sabbath: wherefore it is written ( Jn. 7:23 ): "Are you angry at Me because I have healed the whole man on the Sabbath day?" And again, a bodily work that is done to avoid an imminent damage to some external thing does not profane the Sabbath, wherefore our Lord says ( Mat. 12:11 ): "What man shall there be among you, that hath one sheep, and if the same fall into a pit on the Sabbath day, will he not take hold on it and lift it up?"
Reply to Objection 4: In the New Law the observance of the Lord's day took the place of the observance of the Sabbath, not by virtue of the precept but by the institution of the Church and the custom of Christian people. For this observance is not figurative, as was the observance of the Sabbath in the Old Law. Hence the prohibition to work on the Lord' day is not so strict as on the Sabbath: and certain works are permitted on the Lord's day which were forbidden on the Sabbath, such as the cooking of food and so forth. And again in the New Law, dispensation is more easily granted than in the Old, in the matter of certain forbidden works, on account of their necessity, because the figure pertains to the protestation of truth, which it is unlawful to omit even in small things; while works, considered in themselves, are changeable in point of place and time.
Whether the fourth precept, about honoring one's parents, is fittingly expressed?
Objection 1: It seems that the fourth precept, about honoring one's parents, is unfittingly expressed. For this is the precept pertaining to piety. Now, just as piety is a part of justice, so are observance, gratitude, and others of which we have spoken (QQ[101],102, seq.). Therefore it seems that there should not have been given a special precept of piety, as none is given regarding the others.
Objection 2: Further, piety pays worship not only to one's parents, but also to one's country, and also to other blood kindred, and to the well-wishers of our country, as stated above (Q[101], AA[1],2). Therefore it was unfitting for this precept to mention only the honoring of one's father and mother.
Objection 3: Further, we owe our parents not merely honor but also support. Therefore the mere honoring of one's parents is unfittingly prescribed.
Objection 4: Further, sometimes those who honor their parents die young, and on the contrary those who honor them not live a long time. Therefore it was unfitting to supplement this precept with the promise, "That thou mayest be long-lived upon earth."
On the contrary, stands the authority of Scripture.
I answer that, The precepts of the decalogue are directed to the love of God and of our neighbor. Now to our parents, of all our neighbors, we are under the greatest obligation. Hence, immediately after the precepts directing us to God, a place is given to the precept directing us to our parents, who are the particular principle of our being, just as God is the universal principle: so that this precept has a certain affinity to the precepts of the First Table.
Reply to Objection 1: As stated above (Q[101], A[2]), piety directs us to pay the debt due to our parents, a debt which is common to all. Hence, since the precepts of the decalogue are general precepts, they ought to contain some reference to piety rather than to the other parts of justice, which regard some special debt.
Reply to Objection 2: The debt to one's parents precedes the debt to one's kindred and country since it is because we are born of our parents that our kindred and country belong to us. Hence, since the precepts of the decalogue are the first precepts of the Law, they direct man to his parents rather than to his country and other kindred. Nevertheless this precept of honoring our parents is understood to command whatever concerns the payment of debt to any person, as secondary matter included in the principal matter.
Reply to Objection 3: Reverential honor is due to one's parents as such, whereas support and so forth are due to them accidentally, for instance, because they are in want, in slavery, or the like, as stated above (Q[101], A[2] ). And since that which belongs to a thing by nature precedes that which is accidental, it follows that among the first precepts of the Law, which are the precepts of the decalogue, there is a special precept of honoring our parents: and this honor, as a kind of principle, is understood to comprise support and whatever else is due to our parents.
Reply to Objection 4: A long life is promised to those who honor their parents not only as to the life to come, but also as to the present life, according to the saying of the Apostle ( 1 Tim. 4:8 ): "Piety [Douay: 'godliness'] is profitable to all things, having promise of the life that now is and of that which is to come." And with reason. Because the man who is grateful for a favor deserves, with a certain congruity, that the favor should be continued to him, and he who is ungrateful for a favor deserves to lose it. Now we owe the favor of bodily life to our parents after God: wherefore he that honors his parents deserves the prolongation of his life, because he is grateful for that favor: while he that honors not his parents deserves to be deprived of life because he is ungrateful for the favor. However, present goods or evils are not the subject of merit or demerit except in so far as they are directed to a future reward, as stated above (FS, Q[114], A[12]). Wherefore sometimes in accordance with the hidden design of the Divine judgments, which regard chiefly the future reward, some, who are dutiful to their parents, are sooner deprived of life, while others, who are undutiful to their parents, live longer.
Whether the other six precepts of the decalogue are fittingly expressed?
Objection 1: It seems that the other six precepts of the decalogue are unfittingly expressed. For it is not sufficient for salvation that one refrain from injuring one's neighbor; but it is required that one pay one's debts, according to Rom. 13:7, "Render . . . to all men their dues." Now the last six precepts merely forbid one to injure one's neighbor. Therefore these precepts are unfittingly expressed.
Objection 2: Further, these precepts forbid murder, adultery, stealing and bearing false witness. But many other injuries can be inflicted on one's neighbor, as appears from those which have been specified above (QQ[72], seq.). Therefore it seems that the aforesaid precepts are unfittingly expressed.
Objection 3: Further, concupiscence may be taken in two ways. First as denoting an act of the will, as in Wis. 6:21, "The desire [concupiscentia] of wisdom bringeth to the everlasting kingdom": secondly, as denoting an act of the sensuality, as in James 4:1, "From whence are wars and contentions among you? Are they not . . . from your concupiscences which war in your members?" Now the concupiscence of the sensuality is not forbidden by a precept of the decalogue, otherwise first movements would be mortal sins, as they would be against a precept of the decalogue. Nor is the concupiscence of the will forbidden, since it is included in every sin. Therefore it is unfitting for the precepts of the decalogue to include some that forbid concupiscence.
Objection 4: Further, murder is a more grievous sin than adultery or theft. But there is no precept forbidding the desire of murder. Therefore neither was it fitting to have precepts forbidding the desire of theft and of adultery.
On the contrary, stands the authority of Scripture.
I answer that, Just as by the parts of justice a man pays that which is due to certain definite persons, to whom he is bound for some special reason, so too by justice properly so called he pays that which is due to all in general. Hence, after the three precepts pertaining to religion, whereby man pays what is due God, and after the fourth precept pertaining to piety, whereby he pays what is due to his parents---which duty includes the paying of all that is due for any special reason---it was necessary in due sequence to give certain precepts pertaining to justice properly so called, which pays to all indifferently what is due to them.
Reply to Objection 1: Man is bound towards all persons in general to inflict injury on no one: hence the negative precepts, which forbid the doing of those injuries that can be inflicted on one's neighbor, had to be given a place, as general precepts, among the precepts of the decalogue. On the other hand, the duties we owe to our neighbor are paid in different ways to different people: hence it did not behoove to include affirmative precepts about those duties among the precepts of the decalogue.
Reply to Objection 2: All other injuries that are inflicted on our neighbor are reducible to those that are forbidden by these precepts, as taking precedence of others in point of generality and importance. For all injuries that are inflicted on the person of our neighbor are understood to be forbidden under the head of murder as being the principal of all. Those that are inflicted on a person connected with one's neighbor, especially by way of lust, are understood to be forbidden together with adultery: those that come under the head of damage done to property are understood to be forbidden together with theft: and those that are comprised under speech, such as detractions, insults, and so forth, are understood to be forbidden together with the bearing of false witness, which is more directly opposed to justice.