(b) The State has the power to declare and enforce by suitable sanctions the conclusions that are derived from the general principles of the law of nature; for many people might be ignorant of these conclusions or inclined to disregard them, unless they were promulgated and confirmed by human law. Example: The natural law requires that parents provide for their young children, and that children assist their needy parents; the civil law adopts these natural principles, compels their observance, and punishes transgressors.
(c) The State has the power to make concrete and to determine the provisions of the natural law that are abstract or general. Example: The natural law decrees that some form of government be set up, that the people contribute to the support of the government, that crimes be punished, that the general welfare be served, etc.; the civil law determines the special form of government, the manner in which the revenues are to be obtained, the specific penalties for each crime, the public measures that are best suited to the circumstances, etc.
548. The relation of the civil law to divine and ecclesiastical law is as follows:
(a) In matters purely spiritual the State has no power to legislate, since its end and authority are confined to things temporal; and hence the State has no right to interfere with the faith, worship and government of the Church. But, since morality promotes the prosperity of the State, and since the end of the individual is spiritual, the civil law should respect and favor religion.
(b) In matters that are partly spiritual, partly temporal, the State has the power to legislate on those aspects that are temporal, yet so as not to infringe on divine or ecclesiastical right. Example: Civil laws on education have the right to regulate non-religious subjects, courses, standards, etc.; but they have no right to proscribe religious training, or to prescribe the teaching of irreligion or immorality, State laws on marriage may require registration, settle the civil effects of marriage, etc., but they have no right to interfere with the unity of marriage or the sanctity of the marriage bond.
549. The State is for the individual, and not the individual for the State; hence, civil law should not interfere with human liberties, except where this is necessary for the common peace and safety or the lawful opportunity of the people as a whole. Hence:
(a) Human liberties that are not inalienable may be limited by the law, when the public good or the welfare of individuals requires this (see 292). Examples: The State has the right to regulate the acts of those who are unable to take care of themselves in matters of importance; to forbid what is detrimental to the common interest (such as hunting and fishing at certain seasons), to protect the public when it neglects to protect itself, etc. Uncalled-for interference by government with the personal and private affairs of individuals—paternalism in government—is of course to be avoided, for restriction of liberty is something disagreeable and should not be resorted to without necessity.
(b) Human rights that are fundamental (such as the rights to live, to marry, to rear a family, to be free, to pursue happiness) should not be trespassed on by civil law. Thus, the State has no right to forbid marriage to the poor, but on the contrary it has the duty to remove conditions that cause poverty. But, when the common welfare demands the sacrifice, the State has the right to call on citizens to expose even life and fortune in its defense.
550. Those Subject to Civil Law.—Civil laws oblige all those who are in any way subject to their authority.
(a) Citizens, when in the country, are bound by all the laws that pertain to them; when outside the country, they are bound by some laws, such as those that regulate their personal status and office, but not by others, in particular such as are of a territorial character.