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Roman Catechism
PART III: THE DECALOGUE
Importance Of Instruction On The Commandments

St. Augustine in his writings remarks that the Decalogue is the summary and epitome of all laws: Although the Lord had spoken many things, He gave to Moses only two stone tablets, called “tables of testimony,” to be placed in the Ark. For if carefully examined and well understood, whatever else is commanded by God will be found to depend on the Ten Commandments which were engraved on those two tables, just as these Ten Commandments, in turn, are reducible to two, the love of God and of our neighbour, on which “depend the whole law and the prophets.”

Since, then, the Decalogue is a summary of the whole Law, the pastor should give his days and nights to its consideration, that he may be able not only to regulate his own life by its precepts, but also to instruct in the law of God the people committed to his care. The lips of the priest shall keep knowledge, and they shall seek the law at his mouth, because he is the angel of the Lord of hosts. To the priests of the New Law this injunction applies in a special manner; they are nearer to God, and should be transformed from glory to glory, as by the Spirit of the Lord. Since Christ our Lord has called them light, it is their special duty to be a light to them that are in darkness, the instructors of the foolish, the teachers of infants; and if a man be overtaken in any fault, they who are spiritual should instruct such a one.

In the tribunal of penance the priest holds the place of a judge, and pronounces sentence according to the nature and gravity of the offence. Unless, therefore, he is desirous that his ignorance should prove an injury to himself and to others, he must bring with him to the discharge of this duty the greatest vigilance and the most practiced acquaintance with the interpretation of the law, in order to be able to pronounce, according to this divine rule, on every act and omission; and, as the Apostle says, to teach sound doctrine, free from error, and heal the diseases of the soul, which are sins, in order that the people may be acceptable to God, pursuers of good works.