15. Moral, ceremonial, and judicial law distinguished

The moral law, then, (to begin with it,) being contained under two heads, the one of which simply enjoins us to worship God with pure faith and piety, the other to embrace men with sincere affection, is the true and eternal rule of righteousness prescribed to the men of all nations and of all times, who would frame their life agreeably to the will of God. For his eternal and immutable will is, that we are all to worship him, and mutually love one another.

The ceremonial law of the Jews was a tutelage by which the Lord was pleased to exercise, as it were, the childhood of that people, until the fulness of the time should come when he was fully to manifest his wisdom to the world, and exhibit the reality of those things which were then adumbrated by figures, (Gal. 3: 24; 4: 4.)

The judicial law, given them as a kind of polity, delivered certain forms of equity and justice, by which they might live together innocently and quietly.

And as that exercise in ceremonies properly pertained to the doctrine of piety, inasmuch as it kept the Jewish Church in the worship and religion of God, yet was still distinguishable from piety itself, so the judicial form, though it looked only to the best method of preserving that charity which is enjoined by the eternal law of God, was still something distinct from the precept of love itself. Therefore, as ceremonies might be abrogated without at all interfering with piety, so also, when these judicial arrangements are removed, the duties and precepts of charity can still remain perpetual.

But if it is true that each nation has been left at liberty to enact the laws which it judges to be beneficial, still these are always to be tested by the rule of charity, so that while they vary in form, they must proceed on the same principle. Those barbarous and savage laws, for instance, which conferred honour on thieves, allowed the promiscuous intercourse of the sexes, and other things even fouler and more absurd, I do not think entitled to be considered as laws, since they are not only altogether abhorrent to justice, but to humanity and civilised life.