(f) Conscience judges concerning the morality of an act. Here lies the difference between consciousness and conscience; consciousness is a psychological faculty whose function is to perceive one’s own states and acts; conscience is a moral judgment concerning the lawfulness or unlawfulness of those states or acts. Thus, consciousness testifies that one is considering the performance of a certain act, conscience judges the morality, and permits or forbids; or consciousness testifies that a certain thing was done or not done in the past, conscience declares the morality—condemning, excusing, or approving what took place.
(g) Conscience judges concerning a particular act—that is, it considers an act that is to be done here and now (or was done), with all the attendant circumstances. Conscience, thus, differs from moral science, which, though it systematizes the body of conclusions drawn from the natural and positive laws, is not able to make the applications for the innumerable cases that arise. Even works containing moral cases, which give solutions for concrete instances, do not take the place of conscience in such instances, for it is still the individual who judges about those solutions or about their applicability to his particular circumstances.
576. Division.-Conscience is variously divided. (a) According as the act judged is in the future or in the past, conscience is antecedent or consequent. The antecedent conscience is a monitor which decides that a future act will be lawful or unlawful; the consequent conscience is a judge which causes peace or remorse for what has been done in the past. (b) According to the kind of direction or decision it gives, antecedent conscience is commanding, forbidding, permitting or counselling; while consequent conscience is excusing, approving, or condemning (Rom., ii. 15).
577. According as it agrees or disagrees with the external divine or human law, conscience is true or false. (a) A true conscience judges that to be good and commanded which is really good and commanded. Example: According to law, one may use money of which one has the disposal. A sum of money before Balbus is really at his disposal. Hence, his conscience is true if it decides that he may use this money.
(b) A false conscience judges the lawful to be unlawful, or vice versa: “The hour cometh that whosoever killeth you will think that he doth a service to God” (John, xvi. 2). Example: Balbus would have a false conscience, if he decided that he had no right to use the money before him. This would happen if he was mistaken about the general principle, or about the fact that the money was at his disposal, or if he drew a wrong inference from the premises.
578. According to its qualities and suitability as a guide of conduct, conscience may be viewed either with reference to the will or to the intellect. (a) With reference to the will, conscience is either good (right) or bad (wrong), according as it does or does not proceed from a well-meaning intention and a right disposition towards one’s end and duties. Example: If the Balbus mentioned above decided that the money was at his disposal because he wished to know the truth and had investigated to the best of his ability, his conscience would be good. But, if he decided this without sufficient investigation and only because he was prejudiced in his own favor, his conscience would be bad.
(b) With reference to the intellect, conscience is either certain or uncertain, according as the mind assents to its judgment without or with fear of error. Examples: If Balbus decides that he has the right to use the money, and is so firmly convinced that his judgment is true that he has no fears or doubts, his conscience is certain. But, if there remain solid difficulties or objections against his judgment which he cannot satisfactorily answer so that he assents to his view only with the fear that he may be wrong, his conscience is uncertain.
579. A conscience may have some and lack others of the qualities just mentioned.
(a) The same conscience may be true and bad, or false and good—that is, the judgment of the intellect may be in agreement with objective facts, but at the same time it may be directed by a wrong will and intention, or vice versa. Examples: Caius, through no fault of his own, is convinced that he is bound to tell a lie to help Sempronius, because Sempronius once helped him by lying. His conscience is false, but good. Titus is really not bound to pay a sum of money demanded of him. But the arguments by which he persuades himself that he is not bound are not honest, since he has recourse to what he knows are hair-splitting distinctions, quibbles and sophistical reasonings. His conscience is true, but bad.
(b) The same conscience may be good and uncertain, or bad and certain. Examples: If the Caius above-mentioned believes he is bound to lie, but has some qualms or suspicions that such conduct might not be right after all, his conscience would be good, seeing that he meant to do what is right; but it would be uncertain, seeing that he is not sure he is right. If the Titus above-mentioned had so habituated himself to insincerity and illogical reasoning that he no longer had any fears about his own judgments, and gave firm and unhesitating assent to his decision that he was not bound to pay the money demanded, his conscience, though bad, would be certain subjectively.