CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2078–2081

2078 In fidelity to Scripture and in conformity with Jesus' example, the tradition of the Church has always acknowledged the primordial importance and significance of the Decalogue.
2079 The Decalogue forms an organic unity in which each "word" or "commandment" refers to all the others taken together. To transgress one commandment is to infringe the whole Law (cf. Jas 2:10-11).
2080 The Decalogue contains a privileged expression of the natural law. It is made known to us by divine revelation and by human reason.
2081 The Ten Commandments, in their fundamental content, state grave obligations. However, obedience to these precepts also implies obligations in matter which is, in itself, light.