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Roman Catechism
How The Third Differs From The Other Commandments
With regard to the exposition of this Commandment, the faithful are carefully to be taught how it agrees with, and how it differs from the others, in order that they may understand why we observe and keep holy not Saturday but Sunday.
The point of difference is evident. The other Commandments of the Decalogue are precepts of the natural law, obligatory at all times and unalterable. Hence, after the abrogation of the Law of Moses, all the Commandments contained in the two tables are observed by Christians, not indeed because their observance is commanded by Moses, but because they are in conformity with nature which dictates obedience to them.
This Commandment about the observance of the Sabbath, on the other hand, considered as to the time appointed for its fulfilment, is not fixed and unalterable, but susceptible of change, and belongs not to the moral, but the ceremonial law. Neither is it a principle of the natural law; we are not instructed by nature to give external worship to God on that day, rather than on any other. And in fact the Sabbath was kept holy only from the time of the liberation of the people of Israel from the bondage of Pharaoh. The observance of the Sabbath was to be abrogated at the same time as the other Hebrew rites and ceremonies, that is, at the death of Christ. Having been, as it were, images which foreshadowed the light and the truth, these ceremonies were to disappear at the coming of that light and truth, which is Jesus Christ. Hence St. Paul, in his Epistle to the Galatians, when reproving the observers of the Mosaic rites, says: You observe days and months and times and years; I am afraid of you lest perhaps I have laboured in vain amongst you. And he writes to the same effect to the Colossians.
So much regarding the difference (between this and the other Commandments) .