What is Human Nature? Natural Versus Moral Law

​It has been said that every human being possess the Holy Spirit, whether one believes or does not believe; God never gives up on anyone. It is true that God calls all mankind to himself; however, not all will accept the call. We have the freedom to choose. This freedom is expressed in the intellect, the will and the heart of every man. At the moment of conception, God imprints on each of us a code of conduct to guide and counsel our hearts, giving us the ability to, “Discern by reason between the good and the evil” (CCC 1954). This code is the law of man's nature; it is who we are. This law separates man from animals and the rest of creation. This “code” is our wiring, so to speak, and is referred to as the moral or natural law. This law raises man up to the likeness and image of God. 

“According to Christian tradition, the Law is holy, spiritual and good" (CCC 1963). It reveals the dignity of every man and directs the basis for his core rights and duties. The moral / natural law is permanent in man’s heart. Even complete rejection of its goodness cannot remove it; therefore, it is eternally sealed in every man’s soul. The moral law is the foundation from which man is created and drawn toward God. It is the first stage to the fulfillment of what God intends for his children, which is: life, knowledge, and love. These three were damaged through sin, and it is through the New Law (the law of the Gospel) that man is to be reconciled back to The Father. “The New Law is the grace of the Holy Spirit received by faith in Christ, operating through charity."

For further study refer to the Catechism of the Catholic Church, article 1, 1950, The Moral Law.
KT