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Roman Catechism
These Two Commandments Teach God’s Love For Us And Our Need Of Him
But before we come to the exposition of the Commandments, the faithful are first to be informed that by this law we are taught not only to restrain our inordinate desires, but also to know the boundless love of God towards us.
By the preceding Commandments God had, as it were, fenced us round with safeguards, securing us and ours against injury of every sort; but by the addition of these two Commandments, He intended chiefly to provide against the injuries which we might inflict on ourselves by the indulgence of inordinate desires, as would easily happen were we at liberty to covet all things indiscriminately. By this law then, which forbids to covet, God has blunted in some degree the keenness of desire, which excites to every kind of evil, so that by reason of His command these desires are to some extent diminished, and we ourselves, freed from the annoying importunity of the passions, are enabled to devote more time to the performance of the numerous and important duties of piety and religion which we owe to God.
Nor is this the only lesson of instruction which we derive from these Commandments. They also teach us that the divine law is to be observed not only by the external performance of duties, but also by the internal concurrence of the heart. Between divine and human laws, then, there is this difference, that human laws are fulfilled by an external compliance alone, whereas the laws of God, since He reads the heart, require purity of heart, sincere and undefiled integrity of soul.
The law of God, therefore, is a sort of mirror, in which we behold the corruption of our own nature; and hence these words of the Apostle: I had not known concupiscence, if the law did not say: “Thou shalt not covet.” ' Concupiscence, which is the fuel of sin, and which originated in sin, is always inherent in our fallen nature; from it we know that we are born in sin, and, therefore, do we humbly fly for assistance to Him, who alone can efface the stains of sin.