Some of those norms are so basic that they are accessible to all sane human beings: do no harm to the innocent; treat others as you would have them treat you; do not commit adultery. Other norms and virtues deal with more specific aspects of the moral life.
Now we are hopefully poised to draw into clearer distinction the difference between mere opinion about moral matters vs. the genuine judgment of conscience. Note first of all that the process of arriving at both might have many elements in common:
(1) Both will require the exercise of the virtue of prudence - and the more that opining about moral matters seeks the guidance of prudence, the closer it comes to being a genuine effort to get in touch with the judgment of conscience. More on prudence next week.
(2) Both require deliberation, and often the input from friends, the knowledge of current opinions on the matter, and as thorough a knowledge as possible of all the relevant facts.
(3) Both will take the form of a judgment; and to complicate matters, we will often express our genuine conscience judgments in the form of opinion statements.
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(4) Both processes will seek input from objective moral principles and norms; again here, the more people refer to those objective moral norms (and in the case of Catholics, the more they refer to the Church's moral teaching for guidance), the more they will be approximating the formulation of a genuine judgment of conscience.
It goes without saying that most often persons who end up with a mere opinion on moral matters do so in good faith. As far as they are concerned, they have genuinely exercised conscience or done so to the best of their abilities. They are earnestly convinced that the judgment they have arrived at is genuinely the voice of their conscience.
That notwithstanding, how then would the NL tradition distinguish genuine conscience from mere moral opinion? Consider the following examples of what are arguably the expression of mere opinions on moral matters: