The moral law is a work of divine Wisdom. It prescribes the ways and the rules of conduct that lead to the promised beatitude and it forbids the ways that turn away from God.
The natural law which is inscribed by the Creator on the heart of every person consists in a participation in the wisdom and the goodness of God. It expresses that original moral sense which enables one to discern by reason the good and the bad. It is universal and immutable and determines the basis of the duties and fundamental rights of the person as well as those of the human community and civil law.
Because of sin the natural law is not always perceived nor is it recognized by everyone with equal clarity and immediacy. For this reason God “wrote on the tables of the Law what men did not read in their hearts.” (Saint Augustine)
The Old Law is the first stage of revealed Law. It expresses many truths naturally accessible to reason and which are thus affirmed and authenticated in the covenant of salvation. Its moral prescriptions, which are summed up in the Ten Commandments of the Decalogue, lay the foundations of the human vocation, prohibit what is contrary to the love of God and neighbor, and prescribe what is essential to it.
The Old Law permitted one to know many truths which are accessible to reason, showed what must or must not be done and, above all, like a wise tutor, prepared and disposed one for conversion and for the acceptance of the Gospel. However, while being holy, spiritual, and good, the Old Law was still imperfect because in itself it did not give the strength and the grace of the Spirit for its observance.
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