439. Why does the Decalogue constitute an organic unity?The Ten Commandments form an organic and indivisible whole because each commandment refers to the other commandments and to the entire Decalogue. To break one commandment, therefore, is to violate the entire law.
Further reading: CCC 2069, 2079440. Why does the Decalogue enjoin serious obligations?
It does so because the Decalogue expresses the fundamental duties of man towards God and towards his neighbor.
Further reading: CCC 2072-2073, 2081441. Is it possible to keep the Decalogue?
Yes, because Christ without whom we can do nothing enables us to keep it with the gift of his Spirit and his grace.
Further reading: CCC 2074, 2082