HKB
judge aright, and of prudence in so far as prudence pronounces judgment: wherefore synesis which belongs to prudence is said to "judge rightly," as stated above (Q. 51, A. 3).
Reply Obj. 2: The spiritual man, by reason of the habit of charity, has an inclination to judge aright of all things according to the Divine rules; and it is in conformity with these that he pronounces judgment through the gift of wisdom: even as the just man pronounces judgment through the virtue of prudence conformably with the ruling of the law.
Reply Obj. 3: The other virtues regulate man in himself, whereas justice regulates man in his dealings with others, as shown above (Q. 58, A. 2). Now man is master in things concerning himself, but not in matters relating to others. Consequently where the other virtues are in question, there is no need for judgment other than that of a virtuous man, taking judgment in its broader sense, as explained above (ad 1). But in matters of justice, there is further need for the judgment of a superior, who is "able to reprove both, and to put his hand between both" [*Job 9:33]. Hence judgment belongs more specifically to justice than to any other virtue.
Reply Obj. 4: Justice is in the sovereign as a master-virtue [*Cf. Q. 58, A. 6], commanding and prescribing what is just; while it is in the subjects as an executive and administrative virtue. Hence judgment, which denotes a decision of what is just, belongs to justice, considered as existing chiefly in one who has authority.
SECOND ARTICLE [II-II, Q. 60, Art. 2]
Whether It Is Lawful to Judge?
Objection 1: It would seem unlawful to judge. For nothing is punished except what is unlawful. Now those who judge are threatened with punishment, which those who judge not will escape, according to Matt. 7:1, "Judge not, and ye shall not be judged." Therefore it is unlawful to judge.
Obj. 2: Further, it is written (Rom. 14:4): "Who art thou that judgest another man's servant[?] To his own lord he standeth or falleth." Now God is the Lord of all. Therefore to no man is it lawful to judge.
Obj. 3: Further, no man is sinless, according to 1 John 1:8, "If we say that we have no sin, we deceive ourselves." Now it is unlawful for a sinner to judge, according to Rom. 2:1, "Thou art inexcusable, O man, whosoever thou art, that judgest; for wherein thou judgest another, thou condemnest thyself, for thou dost the same things which thou judgest." Therefore to no man is it lawful to judge.
On the contrary, It is written (Deut. 16:18): "Thou shalt appoint judges and magistrates in all thy gates . . . that they may judge the people with just judgment."
I answer that, Judgment is lawful in so far as it is an act of justice. Now it follows from what has been stated above (A. 1, ad 1, 3) that three conditions are requisite for a judgment to be an act of justice: first, that it proceed from the inclination of justice; secondly, that it come from one who is in authority; thirdly, that it be pronounced according to the right ruling of prudence. If any one of these be lacking, the judgment will be faulty and unlawful. First, when it is contrary to the rectitude of justice, and then it is called "perverted" or "unjust": secondly, when a man judges about matters wherein he has no authority, and this is called judgment "by usurpation": thirdly, when the reason lacks certainty, as when a man, without any solid motive, forms a judgment on some doubtful or hidden matter, and then it is called judgment by "suspicion" or "rash" judgment.