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.

_On the contrary,_ Isidore says (Etym. v, 21) that "laws are enacted

for no private profit, but for the common benefit of the citizens."

_I answer that,_ As stated above (A. 1), the law belongs to that

which is a principle of human acts, because it is their rule and

measure. Now as reason is a principle of human acts, so in reason

itself there is something which is the principle in respect of all

the rest: wherefore to this principle chiefly and mainly law must

needs be referred. Now the first principle in practical matters,

which are the object of the practical reason, is the last end: and

the last end of human life is bliss or happiness, as stated above (Q.

2, A. 7; Q. 3, A. 1). Consequently the law must needs regard

principally the relationship to happiness. Moreover, since every part

is ordained to the whole, as imperfect to perfect; and since one man

is a part of the perfect community, the law must needs regard

properly the relationship to universal happiness. Wherefore the

Philosopher, in the above definition of legal matters mentions both

happiness and the body politic: for he says (Ethic. v, 1) that we

call those legal matters "just, which are adapted to produce and

preserve happiness and its parts for the body politic": since the

state is a perfect community, as he says in _Polit._ i, 1.

Now in every genus, that which belongs to it chiefly is the principle

of the others, and the others belong to that genus in subordination

to that thing: thus fire, which is chief among hot things, is the

cause of heat in mixed bodies, and these are said to be hot in so far

as they have a share of fire. Consequently, since the law is chiefly

ordained to the common good, any other precept in regard to some

individual work, must needs be devoid of the nature of a law, save in

so far as it regards the common good. Therefore every law is ordained

to the common good.

Reply Obj. 1: A command denotes an application of a law to matters

regulated by the law. Now the order to the common good, at which the

law aims, is applicable to particular ends. And in this way commands

are given even concerning particular matters.

Reply Obj. 2: Actions are indeed concerned with particular matters:

but those particular matters are referable to the common good, not as

to a common genus or species, but as to a common final cause,

according as the common good is said to be the common end.

Reply Obj. 3: Just as nothing stands firm with regard to the

speculative reason except that which is traced back to the first

indemonstrable principles, so nothing stands firm with regard to the

practical reason, unless it be directed to the last end which is the

common good: and whatever stands to reason in this sense, has the

nature of a law.

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Summa Theologica, Part I-II (Pars Prima Secundae) From the Complete American Edition · 第 584 / 746 题