A rule of conduct established by competent authority for the common good. In biblical terms, the moral law is the fatherly instruction of God, setting forth the ways which lead to happiness and proscribing those which lead to evil. The divine or eternal law can be either natural or revealed (positive). Natural moral law is inscribed in the heart, and known by human reason. Revealed law is found in the ancient law (Old Testament), notably the ten commandments, and in the new law (Law of the Gospel), the teaching of Christ, notably the Sermon on the Mount, which perfects the ancient law (1950-1974).