370. Definition.—Since human perversity often needs a check in regulations that are not expressly contained in the Natural or in the Divine Law, other laws must be made by society, drawn from those higher laws as conclusions or added to them as determinations, in order to meet special circumstances and necessities.
371. Division of Human Laws.-Human laws are variously divided.
(a) According to the difference of legislators, laws are either ecclesiastical or civil.
b) According to their mode of derivation from the Natural Law, laws belong either to the law of nations (_jus gentium_) or to civil law. To the _jus gentium_ belong those laws which are derived from the Natural Law as conclusions from premises, e.g., the right to private property without which men cannot live peacefully in society. To civil law belongs whatever is derived from Natural Law by way of positive determination by a legislator; e.g., Natural Law dictates that the evil-doer be punished; but that the punishment take a particular form, imprisonment, exile, death, is a determination depending upon the will of the legislator.
The _jus gentium_ is not international law which derives its force and sanction from the free will of the legislator. The law of nations is common to all men and derives its force from the conviction of men that such a law is demanded for the good of mankind. It is not a secondary precept of the Natural Law which is derived from the primary precepts necessarily. Rather it is based upon a contingent set of circumstances; it does not spring from man’s nature absolutely considered, but from the way in which man acts and reacts in his society.
(c) According to the difference of their objects, laws are either affirmative (i.e., preceptive) or negative (i.e., prohibitive). An affirmative law obliges always, but not for every occasion; a negative law obliges always, and for every occasion. Example: The Third and Fourth Commandments are always in force, but it is not necessary to elicit a positive act of compliance at every instant. The other Commandments, which are negative, are not only in force always, but it is necessary at every instant to omit what they forbid.
(d) According to the obligation which they impose, laws are either moral, penal, or moral-penal. Moral laws oblige under pain of sin, penal laws under pain of punishment, moral-penal laws under pain of both.
(e) According to their inclusiveness, laws are either personal or territorial. The former affect the person for whom the law is made, and oblige him even when he is outside the territory of the lawgiver. The latter affect the territory, and hence do not oblige a subject when he is outside the territory affected by the law.
(f) According to their effect, prohibitive laws are either merely prohibitive or irritant. The former make what is forbidden illegal, the latter make it also void.
372. Qualities.—The objects or content of human law must be of such a character: (a) that they do not conflict with the Natural or the Divine Law; (b) that they be beneficial to the community for which they are made.