1 Thessalonians 5:21
But prove all things; hold fast that which is good.
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- Vulgate (Clementine)
- Omnia autem probate : quod bonum est tenete.
- Greek New Testament (SBLGNT)
- πάντα δὲ δοκιμάζετε, τὸ καλὸν κατέχετε,
Haydock's commentary
Prove all things. That is, examine prophecies whether they be true, and the doctrine which you hear from new preachers, and refrain yourselves not only from evil, but from every thing that hath the appearance of evil, and which may disedify and scandalize others. (Witham)
Hold that which is good. This we can best learn from the doctrine of the apostles, and the spirit of the Catholic Church. Men can deceive and be deceived, but the Spirit of God, speaking to us by his Church, can neither deceive us nor be deceived.
From Haydock's Catholic Bible Commentary, 1859, in the transcription made by Todd Easton and kept online by John Paul Wohlschied at johnblood.gitlab.io/haydock.
The Fathers on this verse
Clement of Alexandria The Stromata, or Miscellanies, Chapter XI. What is the Philosophy Which the Apostle Bids Us Shun?
The elements are worshipped, the air by Diogenes, the water by Thales, the fire by Hippasus; and by those who suppose atoms to be the first principles of things, arrogating the name of philosophers, being wretched creatures devoted to pleasure. “Wherefore I pray,” says the apostle, “that your love may abound yet more and more, in knowledge and in all judgment, that ye may approve things that are excellent.” “Since, when we were children,” says the same apostle, “we were kept in bondage under the rudiments of the world. And the child, though heir, differeth nothing from a servant, till the time appointed of the father.” Philosophers, then, are children, unless they have been made men by Christ. “For if the son of the bond woman shall not be heir with the son of the free,” at least he is the seed of Abraham, though not of promise, receiving what belongs to him by free gift. …
Tertullian On the Veiling of Virgins, Chapter XVI
Herein consists the defence of our opinion, in accordance with Scripture, in accordance with Nature, in accordance with Discipline. Scripture founds the law; Nature joins to attest it; Discipline exacts it. Which of these (three) does a custom founded on (mere) opinion appear in behalf of? or what is the colour of the opposite view? God’s is Scripture; God’s is Nature; God’s is Discipline. Whatever is contrary to these is not God’s. If Scripture is uncertain, Nature is manifest; and concerning Nature’s testimony Scripture cannot be uncertain. If there is a doubt about Nature, Discipline points out what is more sanctioned by God. For noth ing is to Him dearer than humility; nothing more acceptable than modesty; nothing more offensive than “glory” and the study of men-pleasing. …
St Augustine A Treatise on Nature and Grace, Shall We Follow Scripture, or Add to Its Declarations?
It is, to be sure, a grand sentence with which he concluded this passage, when he says: “What we read, therefore, let us believe; and what we do not read, let us deem it wicked to add; and let it suffice to have said this of all cases.” On the contrary, I for my part say that we ought not to believe even everything that we read, on the sanction of the apostle’s advice: “Read all things; hold fast that which is good.” Nor is it wicked to add something which we have not read; for it is in our power to add something which we have bona fide experienced as witnesses, even if it so happens that we have not read about it. …
St John Chrysostom Homilies on First Corinthians, Homily XXIX
“To another prophecies; and to another discernings of spirits.” What is, “discernings of spirits?” the knowing who is spiritual, and who is not: who is a prophet, and who a deceiver: as he said to the Thessalonians, “despise not prophesyings:” ( 1 Thess. v. 20, 21 .) but proving all things, hold fast that which is good.” For great was at that time the rush of the false prophets, the devil striving underhand to substitute falsehood for the truth. “To another divers kinds of tongues; to another the interpretation of tongues.” For one person knew what he spake himself, but was unable to interpret to another; while another had acquired both these or the other of the two. Now this seemed to be a great gift because both the Apostles received it first, and the most among the Corinthians had obtained it. But the word of teaching not so. …
St John Chrysostom The Homilies of St. John Chrysostom on Philippians, Colossians, and Thessalonians, 1 Thessalonians 5:19-22
1 Thessalonians v. 19-22 “Quench not the Spirit. Despise not prophesyings. But prove all things; hold fast that which is good. Abstain from every form of evil.”
Socrates Scholasticus Book III, Of the Literary Labors of the Two Apollinares and the Emperor's Prohibition of Christians being instructed in Greek Literature
The imperial law which forbade Christians to study Greek literature, rendered the two Apolli nares of whom we have above spoken, much more distinguished than before. For both being skilled in polite learning, the father as a grammarian, and the son as a rhetorician, they made themselves serviceable to the Christians at this crisis. For the former, as a grammarian, composed a grammar consistent with the Christian faith: he also translated the Books of Moses into heroic verse; and paraphrased all the historical books of the Old Testament, putting them partly into dactylic measure, and partly reducing them to the form of dramatic tragedy. He purposely employed all kinds of verse, that no form of expression peculiar to the Greek language might be unknown or unheard of amongst Christians. …
St Pamphilus Translation of Pamphilus' Defence of Origen
You have been moved by your desire to know the truth, Macarius, who are “a man greatly beloved,” to make a request of me, which will bring you the blessing attached to the knowledge of the truth; but it will win for me the greatest indignation on the part of those who consider themselves aggrieved whenever any one does not think evil of Origen. It is true that it is not my opinion about him that you have asked for, but that of the holy martyr Pamphilus; and you have requested to have the book which he is said to have written in his defence in Greek translated for you into Latin: nevertheless I do not doubt that there will be some who will think themselves aggrieved if I say anything in his defence even in the words of another man. …
Rufinus The Apology of Rufinus. Addressed to Apronianus, in Reply to Jerome's Letter to Pammachius, Pamphilus Apology for Origen
If then any one wishes to have a statement of our faith, he has it in these words. And whatever we read or affirm, or whatever translations we make, we do it without prejudice to this faith of ours, according to the words of the apostle: “Prove all things, hold fast that which is good. Abstain from every form of evil.” “And as many as follow this rule, peace be upon them; and upon the Israel of God.”
St Gregory of Nyssa On the Making of Man, What was the life in Paradise, and what was the forbidden tree?
1. What then is that which includes the knowledge of good and evil blended together, and is decked with the pleasures of sense? I think I am not aiming wide of the mark in employing, as a starting-point for my speculation, the sense of “knowable.” It is not, I think, “science” which the Scripture here means by “knowledge”; but I find a certain distinction, according to Scriptural use, between “knowledge” and “discernment”: for to “dis cern” skilfully the good from the evil, the Apostle says is a mark of a more perfect condition and of “exercised senses,” for which reason also he bids us “prove all things,” and says that “discernment” belongs to the spiritual man: but “knowledge” is not always to be understood of skill and acquaintance with anything, but of the disposition towards what is agreeable, as “the Lord knoweth them that are His”; and He says to Moses, “I knew thee above all”; wh …
St Jerome The Letters of St. Jerome, To Tranquillinus
2. You tell me that many have been deceived by the mistaken teaching of Origen, and that that saintly man, my son Oceanus, is doing battle with their madness. I grieve to think that simple folk have been thrown off their balance, but I am rejoiced to know that one so learned as Oceanus is doing his best to set them right again. Moreover you ask me, insignificant though I am, for an opinion as to the advisability of reading Origen’s works. Are we, you say, to reject him altogether with our brother Faustinus, or are we, as others tell us, to read him in part? My opinion is that we should sometimes read him for his learning just as we read Tertullian, Novatus, Arnobius, Apollinarius and some other church writers both Greek and Latin, and that we should select what is good and avoid what is bad in their writings according to the words of the Apostle, “Prove all things: hold fast that which i …
St Jerome The Letters of St. Jerome, To Pammachius and Oceanus
7. But it will be said, “If you knew these things, why did you praise him in your works?” I should praise him today but that you and men like you praise his errors. I should still find his talent attractive, but that some people have been attracted by his impiety. “Read all things,” says the apostle, “hold fast that which is good.” Lactantius in his books and particularly in his letters to Demetrian altogether denies the subsistence of the Holy Spirit, and following the error of the Jews says that the passages in which he is spoken of refer to the Father or to the Son and that the words ‘holy spirit’ merely prove the holiness of these two persons in the Godhead. …
St Cyril of Jerusalem Concerning the Unity of God. On the Article, I Believe in One God. Also Concerning Heresies
36. Make thou thy fold with the sheep: flee from the wolves: depart not from the Church. Hate those also who have ever been suspected in such matters: and unless in time thou perceive their repentance, do not rashly trust thyself among them. The truth of the Unity of God has been delivered to thee: learn to distinguish the pastures of doctrine. Be an approved banker, holding fast that which is good, abstaining from every form of evil . Or if thou hast ever been such as they, recognise and hate thy delusion. For there is a way of salvation, if thou reject the vomit, if thou from thy heart detest it, if thou depart from them, not with thy lips only, but with thy soul also: if thou worship the Father of Christ, the God of the Law and the Prophets, if thou acknowledge the Good and the Just to be one and the same God. …
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The Fathers are given as they wrote. Where a passage lays the Passion on the Jewish people, the Church teaches that it cannot be charged against all the Jews then living, nor against the Jews of today, and that all sinners were its authors (CCC 597, 598).