Part II (Pars Prima Secundae) Part 141 (1/2)

We have now to consider the extrinsic principles of acts. Now the extrinsic principle inclining to evil is the devil, of whose temptations we have spoken in the First Part (Q. 114). But the extrinsic principle moving to good is G.o.d, Who both instructs us by means of His Law, and a.s.sists us by His Grace: wherefore in the first place we must speak of law; in the second place, of grace.

Concerning law, we must consider: (1) Law itself in general; (2) its parts. Concerning law in general three points offer themselves for our consideration: (1) Its essence; (2) The different kinds of law; (3) The effects of law.

Under the first head there are four points of inquiry:

(1) Whether law is something pertaining to reason?

(2) Concerning the end of law;

(3) Its cause;

(4) The promulgation of law.

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FIRST ARTICLE [I-II, Q. 90, Art. 1]

Whether Law Is Something Pertaining to Reason?

Objection 1: It would seem that law is not something pertaining to reason. For the Apostle says (Rom. 7:23): ”I see another law in my members,” etc. But nothing pertaining to reason is in the members; since the reason does not make use of a bodily organ. Therefore law is not something pertaining to reason.

Obj. 2: Further, in the reason there is nothing else but power, habit, and act. But law is not the power itself of reason. In like manner, neither is it a habit of reason: because the habits of reason are the intellectual virtues of which we have spoken above (Q. 57).

Nor again is it an act of reason: because then law would cease, when the act of reason ceases, for instance, while we are asleep.

Therefore law is nothing pertaining to reason.

Obj. 3: Further, the law moves those who are subject to it to act aright. But it belongs properly to the will to move to act, as is evident from what has been said above (Q. 9, A. 1). Therefore law pertains, not to the reason, but to the will; according to the words of the Jurist (Lib. i, ff., De Const. Prin. leg. i): ”Whatsoever pleaseth the sovereign, has force of law.”

_On the contrary,_ It belongs to the law to command and to forbid.

But it belongs to reason to command, as stated above (Q. 17, A. 1).

Therefore law is something pertaining to reason.

_I answer that,_ Law is a rule and measure of acts, whereby man is induced to act or is restrained from acting: for _lex_ (law) is derived from _ligare_ (to bind), because it binds one to act. Now the rule and measure of human acts is the reason, which is the first principle of human acts, as is evident from what has been stated above (Q. 1, A. 1, ad 3); since it belongs to the reason to direct to the end, which is the first principle in all matters of action, according to the Philosopher (Phys. ii). Now that which is the principle in any genus, is the rule and measure of that genus: for instance, unity in the genus of numbers, and the first movement in the genus of movements. Consequently it follows that law is something pertaining to reason.

Reply Obj. 1: Since law is a kind of rule and measure, it may be in something in two ways. First, as in that which measures and rules: and since this is proper to reason, it follows that, in this way, law is in the reason alone. Secondly, as in that which is measured and ruled. In this way, law is in all those things that are inclined to something by reason of some law: so that any inclination arising from a law, may be called a law, not essentially but by partic.i.p.ation as it were. And thus the inclination of the members to concupiscence is called ”the law of the members.”

Reply Obj. 2: Just as, in external action, we may consider the work and the work done, for instance the work of building and the house built; so in the acts of reason, we may consider the act itself of reason, i.e. to understand and to reason, and something produced by this act. With regard to the speculative reason, this is first of all the definition; secondly, the proposition; thirdly, the syllogism or argument. And since also the practical reason makes use of a syllogism in respect of the work to be done, as stated above (Q. 13, A. 3; Q. 76, A. 1) and since as the Philosopher teaches (Ethic. vii, 3); hence we find in the practical reason something that holds the same position in regard to operations, as, in the speculative intellect, the proposition holds in regard to conclusions. Such like universal propositions of the practical intellect that are directed to actions have the nature of law. And these propositions are sometimes under our actual consideration, while sometimes they are retained in the reason by means of a habit.

Reply Obj. 3: Reason has its power of moving from the will, as stated above (Q. 17, A. 1): for it is due to the fact that one wills the end, that the reason issues its commands as regards things ordained to the end. But in order that the volition of what is commanded may have the nature of law, it needs to be in accord with some rule of reason. And in this sense is to be understood the saying that the will of the sovereign has the force of law; otherwise the sovereign's will would savor of lawlessness rather than of law.

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SECOND ARTICLE [I-II, Q. 90, Art. 2]

Whether the Law Is Always Something Directed to the Common Good?

Objection 1: It would seem that the law is not always directed to the common good as to its end. For it belongs to law to command and to forbid. But commands are directed to certain individual goods.

Therefore the end of the law is not always the common good.

Obj. 2: Further, the law directs man in his actions. But human actions are concerned with particular matters. Therefore the law is directed to some particular good.

Obj. 3: Further, Isidore says (Etym. v, 3): ”If the law is based on reason, whatever is based on reason will be a law.” But reason is the foundation not only of what is ordained to the common good, but also of that which is directed to private good. Therefore the law is not only directed to the good of all, but also to the private good of an individual.