But prove all things; hold fast that which is good.

“"Be at peace among yourselves. Now we admonish you, brethren, warn them who are unruly, comfort the feeble-minded, support the weak, be patient toward all men. See that none render evil for evil to any man. Quench not the Spirit. Despise not prophesyings. Prove all things: hold fast that which is good. Abstain from every form of evil."”

“And therefore "heresies must needs be in order that they which are approved might be made manifest," both those who remained stedfast under persecution, and those who did not wander out of their way into heresy. For the apostle does not mean that those persons should be deemed approved who exchange their creed for heresy; although they contrariously interpret his words to their own side, when he says in another passage, "Prove all things; hold fast that which is good; " as if, after proving all things amiss, one might not through error make a determined choice of some evil thing.”

“I indeed gave attention to reading the books and carefully studying the traditions of heretics, to the extent indeed of corrupting my soul with their execrable opinions; yet receiving from them this advantage, that I could refute them in my own mind, and detested them more heartily than ever. And when a certain brother of the order of presbyters sought to deter me, and feared lest I should be involved in the same wicked filthiness, because he said that my mind would be contaminated, and indeed with truth, as I myself perceived, I was strengthened by a vision that was sent me from God. And a word spoken to me, expressly commanded me, saying, Read everything which shall come into thy hands, for thou art fit to do so, who correctest and provest each one; and from them to thee first of all has appeared the cause and the occasion of believing. I received this vision as being what was in accordance with the apostolic word, which thus urges all who are endowed with greater virtue, "Be ye skilful money-changers."”

“But there is also another explanation. There were among them many indeed who prophesied truly, but some prophesied falsely. For the devil, of his vile craft, wished through this gift of grace to subvert everything pertaining to the Church. For since both the demon and the Spirit prophesied concerning the future, the one indeed uttering falsehood, and the other truth, and it was not possible from any quarter to receive a proof of one or the other, He gave also the "discernings of spirits." Since therefore then also among the Thessalonians many were prophesying, glancing at whom he says, "Neither by word, nor by epistle, as from us, as that the day of the Lord is now present" (2 Thess. ii. 2), he says this here. Seest thou that this is what he means by, "Prove all things"? Because he had said, "Despise not prophesyings," lest they should think that he opened the pulpit to all, he says, "Prove all things," that is, such as are really prophecies; "and hold fast that which is good. Abstain from every form of evil"; not from this or that, but from all; that you may by proof distinguish both the true things and the false, and abstain from the latter, and hold fast the former. For thus both the hatred of the one will be vehement and the love of the other arises, when we do all things not carelessly, nor without examination, but with careful investigation.”

“Above he showed how subjects ought to conduct themselves toward their prelates; here he shows the converse. And concerning this he does two things: first he teaches how prelates ought to conduct themselves toward subject priests; second, generally, how they ought to conduct themselves toward all, at the place "see that no one." But it should be known that the care of prelates ought to tend to two things, namely to drawing others back from sins, and to guarding themselves. As to the first, the Apostle says three things. For subjects can suffer defect in three ways: first in act, second in will, third in power. In act, when they burst forth into an act of sin, and then they are to be corrected. And although this holds for every sin, yet they are especially to be corrected concerning the sin of restlessness. And therefore he says "rebuke the unruly." 2 Thess. 3:7: "we were not unruly among you." Ecclesiasticus 19:17: "rebuke your neighbor before you threaten, and give place to fear." In will, when one does not undertake great things, because he is cast down on account of adversities and preceding sins. Hence he says "comfort the fainthearted." The fainthearted is one not having courage for great things, fearing lest he fail. Isaiah 35:4: "say to the fainthearted: take courage and do not fear." Job 4:4: "your hands have strengthened the wavering," etc. In power, when they either sin from weakness, or are weakened in a good act, and these are to be cherished. Hence he says "support," namely by cherishing in the bowels of charity, "the weak," whose power is feeble, either for resisting evils or for doing good. Romans 15:1: "we who are stronger ought to bear the weaknesses of the weak." But the prelate ought to guard himself from defect of whatever kind, and especially from impatience, because he himself carries the whole weight of the multitude. Numbers 11:14: "I cannot alone bear this whole multitude, because it is heavy for me," etc. And therefore he says "be patient toward all." Proverbs 19:11: "the teaching of a man is known through patience." Ps. 91:15: "they will be well patient, that they may proclaim." Then when he says "see that no one," he shows generally how they should conduct themselves toward all. And concerning this he does two things: first he shows how all ought to conduct themselves in certain matters; second, what in all matters, at "but all things." Concerning the first he does three things: first he shows how they ought to conduct themselves toward the neighbor; second, how they should conduct themselves in the things that pertain to God, at "rejoice always"; third, how they should conduct themselves toward his gifts, at "do not [quench] the spirit." As to the neighbor, they ought to conduct themselves so as not to inflict evils on him, and so as to strive to do him good. Hence he says: I said above in particular, but now I say in general, let no one... evil, etc. Ps.: "if I have returned evils to those who repaid me." But on the contrary: vengeance is often sought before a judge. I respond. Just as a moral act is taken according to the intention of the end, so the intention toward two things can be: either toward the evil of that person, such that it rests there, and this is unlawful, because it comes from the rancor of vengeance; or toward the good of correction, or of justice and the preservation of the commonwealth, and thus he does not render evil for evil, but good, namely his correction. As to the second he says "but always what is good," etc. And he says "pursue," not "do": because you ought to take from yourself the occasion of doing good to your neighbor, and not wait for him to give you the occasion of doing good to him. Hence Ps. 33:15: "seek peace, and pursue it." Romans 12:21: "do not be conquered by evil," namely so that you are drawn by it to do evil, "but conquer evil with good," by drawing it back to good. Gal., last chapter: "while we have time, let us do good to all." Then when he says "rejoice always," he shows how they ought to conduct themselves with regard to God, toward whom three things must be had. First, to rejoice in him; hence he says "rejoice always," namely in God, because whatever evil may occur is incomparable to the good, which is God. And therefore let no evil interrupt that; hence he says "rejoice always." Second, "pray" for benefits to be received, at "pray without ceasing." Luke 18:1: "one must always pray, and never fail." But how can this be? I respond. It must be said that this can be in three ways. First, that he always prays who does not omit the appointed hours. A similar thing is found in 2 Kings 9:7: "you shall eat bread at my table always." Second, thus: "always," that is, "pray continually," but then prayer is taken for the effect of prayer. For prayer is the interpretation or unfolding of desire, because when I desire something, then I seek it by praying. Hence prayer is also a petition for fitting things from God, and therefore desire has the force of prayer. Ps. 9:38: "the Lord has heard the desire of the poor." All things therefore that we do proceed from desire. Therefore prayer remains virtually in the good things we do, because the good things we do proceed from good desire. The Gloss: "he does not cease to pray, who does not cease to do good." Third, as to the cause of prayer, namely by giving alms. In the Lives of the Fathers: "he always prays who gives alms, because he who has received alms prays for you, even while you sleep." Likewise, third, to pray for benefits to be received and to give thanks for those received; therefore he says "in all things," namely in good things and in adverse things, "give thanks." Romans 8:28: "for those who love God, all things work together unto good." Colossians 2:7: "abounding in him in thanksgiving." Philippians 4:6: "with thanksgiving. For this is the will," etc. 1 Timothy 2:4: "who wills all men to be saved, and to come to the knowledge of the truth." Then when he says "do not [quench] the spirit," etc., he shows how they should conduct themselves toward the gifts of God. And first, that they not impede them; second, that they not despise them, at "prophecies." Now the Holy Spirit is a divine person, incorruptible and eternal, hence in his substance he cannot be extinguished. But nevertheless someone is said to extinguish the spirit, in one way, by extinguishing his fervor, either in himself or in another. Romans 12:11: "fervent in spirit." For when someone wills to do something good from the fervor of the Holy Spirit, or also when some good movement arises, and he himself impedes it, he extinguishes the Holy Spirit. Acts 7:51: "you have always resisted the Holy Spirit." In another way, by sinning mortally. For the Holy Spirit in himself always lives, but in us he lives when he makes us live in him; but when someone sins mortally, the Holy Spirit does not live in him. Wisdom 1:5: "for the Holy Spirit of discipline will flee the deceitful," etc. In a third way, by hiding it, as if he were to say: if you have the gift of the Holy Spirit, use it for the benefit of your neighbors. Ecclesiasticus 20:32: "hidden wisdom and unseen treasure, what use is there in either?" Matthew 5:15: "no one lights a lamp and puts it under a bushel," etc. "Do not despise prophecies." For some among these were endowed with the spirit of prophecy, who were reckoned by these others as insane. 1 Corinthians 14:1: "be zealous for spiritual things, but rather that you may prophesy." Or "prophecies," that is, divine teaching. For those expounding divine teaching are called prophets; as if he were to say: do not despise the words of God and the preachings. Jeremiah 20:8: "the word of the Lord has become a reproach and a derision all the day." Then when he says "but test all things," he shows how they should conduct themselves toward all things, and it is one point, that in all things they use discretion. Romans 12:1: "your reasonable service." In this matter there ought to be diligent examination, choice of the good, rejection of the bad. As to the first he says "do not despise prophecies," yet "test all things," namely those that are doubtful. For manifest things do not need examination. 1 John 4:1: "do not believe every spirit." Job 12:8: "does not the ear discern words?" As to the second he says "hold fast what is good." Galatians 4:18: "but be zealous for good, in a good thing, always." As to the third he says "abstain from every appearance of evil." Isaiah 7:15: "that he may know to refuse the evil and choose the good." And he says "appearance," because we ought also to avoid even those things which have the likeness of malice, which namely we could not observe before men without scandal to them. Then when he says "but he himself," he adds a prayer, and concerning this he does three things: first he prays for them; second he gives hope of being heard; third he gives special admonitions. He says therefore: thus I admonish, but it avails nothing unless God gives grace. Hence "may the God of peace himself sanctify you." Leviticus 21:8: "I am the Lord, who sanctifies you," etc. "In every part," that is, that you may be wholly holy. And this "that [your] whole [spirit]," etc. For on the occasion of these words some said that in man the spirit is one thing and the soul another, positing two souls in man, one which animates, the other which reasons. And these have been condemned in ecclesiastical teachings. Hence it should be known that these do not differ according to essence, but according to power. For in our soul there are certain powers which are acts of bodily organs, as are the powers of the sensitive part. There are others, which are not acts of such organs, but are abstracted from them, as are the powers of the intellective part. And these are called "spirit," as being immaterial and separated in some way from the body, inasmuch as they are not acts of the body, and they are also called "mind." Ephesians 4:23: "be renewed in the spirit of your mind." But insofar as it animates, it is called "soul," because this is proper to it. And Paul here speaks properly. For three things concur in sinning: reason, sensuality, and the execution of the body. He wishes therefore that there be sin in none of these. Not in reason; hence he says "that [your] spirit," that is, your mind, "may be kept whole." For in every sin reason is corrupted, according as every evil man is ignorant. Likewise, nor in sensuality, hence he says "soul." Likewise, nor in body; and therefore he says "and body." But this happens thus, when it is kept immune from sin. And he says "without blame," not "without sin," which belongs to Christ alone; but to be without blame belongs also to others, who, even if they commit venial sins, do not nevertheless commit grave ones, and ones by which the neighbor is scandalized. Luke 1:6: "walking in all the commandments and justifications of the Lord without blame." And he adds "at the coming," etc., namely by persevering until the end of life. Or "whole spirit" refers to the gift of the Holy Spirit, as if he were to say: may the gift of the Holy Spirit, which you have, be whole. Then when he says "faithful," etc., he gives hope of being heard; as if he were to say: as I hope, so it will be, because "he also who has called [you] will do [it]," that is, will fulfill it. Ps. 144:13: "the Lord is faithful in all his words," etc. Romans 8:30: "whom he called, these he also justified," etc. Lastly he appends familiar admonitions: namely prayer, at "pray"; likewise mutual peace, at "greet all the brothers with a holy kiss," not a treacherous one, like Judas, Matthew 26:49, nor a lustful one, like the lustful woman, Proverbs 7:10. "That it be read," etc. For he feared lest the prelates, on account of certain things that were here, might conceal it. Proverbs 11:26: "he who hides grain will be cursed among the peoples," etc. Lastly he concludes the epistle with a salutation.”

“And the very God of peace,.... Or "the God of peace himself". The apostle follows his exhortations with prayer to God, knowing the weakness and impotency of the saints to receive them, and act according to them, and his own insufficiency to impress their minds with them; and that unless the Lord opened their ears to discipline, and sealed instruction to them, they would be useless and in vain: wherefore he applies to the throne of grace, and addresses God as "the God of peace"; so called, because of the concern he has in peace and reconciliation made by the blood of Christ, and because he is the giver of peace of conscience, and the author of peace, concord, and unity among the saints, and of all happiness and prosperity, both in this world, and in that which is to come; See Gill on Rom 15:33. And the apostle might choose to address God under this character, partly to encourage boldness, freedom, and intrepidity at the throne of grace, and partly to raise hope, expectation, and faith of having his requests answered, since God is not an angry God, nor is fury in him, but the God of peace: and the petitions he puts up for the Thessalonians are as follow: and first, that God would sanctify you wholly; or "all of you", as the Arabic version; or "all of you perfectly", as the Syriac version. These persons were sanctified by the Spirit of God, but not perfectly; the Gospel was come to them in power, and had wrought effectually in them, and they were turned from idols to serve the living God, and had true faith, hope, and love, implanted in them, and which they were enabled to exercise in a very comfortable and commendable manner; but yet this work of grace and sanctification begun in them was far from being perfect, nor is it in the best of saints. There is something lacking in the faith of the greatest believer, love often waxes cold, and hope is not lively at all times, and knowledge is but in part; sin dwells in all; the saints are poor and needy, their wants continually return upon them, and they need daily supplies; the most holy and knowing among them disclaim perfection in themselves, though desirous of it. Their sanctification in Christ is perfect, but not in themselves; there is indeed a perfection of parts in internal sanctification, every grace is implanted, there is not one wanting; the new creature, or new man, has all its parts, though these are not come to their full growth; there is not a perfection of degrees, and this is what the apostle prays for; for sanctification is a progressive, gradual work, it is like seed cast into the earth, which springs up, first the blade, then the ear, then the full corn in the ear, and is as light, which shines more and more to the perfect day. Sanctified persons are first as newborn babes, and then they grow up to be young men, and at last become fathers in Christ; and this work being begun, is carried on, and will be performed, fulfilled, and made perfect: and it is God's work to do it; he begins, and he carries it on, and he will finish it; and therefore the apostle prays to him to do it; this is his first petition: the second follows, and I pray God your whole spirit, soul and body, be preserved blameless unto the coming of our Lord Jesus Christ. A like division of man is made by the Jews: says one of their writers (y). "a man cannot know God, unless he knows , "his soul, his breath, or his spirit, and his body".'' Says (z) R. Isaac, "worthy are the righteous in this world, and in the world to come, for lo, they are all holy; their body is holy, their soul is holy, their spirit, and their breath is holy'' See Gill on Heb 4:12. Some by "spirit" understand the graces and gifts of the Spirit in a regenerate man; and by "the soul", the soul as regenerated, and as it is the seat and subject of these graces; and by the body, the habitation of the soul, which is influenced by the grace that is last; and this is a sense not to be despised. Others by "the spirit" understand the rational and immortal soul of man, often called a spirit, as in Ecc 12:7 and by the soul, the animal and sensitive soul, which man has in common with brutes; see Ecc 3:21 and by the "body", the outward frame of flesh and blood, and bones; but rather "spirit" and "soul" design the same immaterial, immortal, and rational soul of man, considered in its different powers and faculties. The "spirit" may intend the understanding, Job 32:8 which is the principal, leading, and governing faculty of the soul; and which being enlightened by the Spirit of God, a man knows himself, Christ Jesus, and the things of the Spirit, the truths of the Gospel, and receives and values them. The "soul" may include the will and affections, which are influenced by the understanding; and in a regenerate man the will is brought to a resignation to the will of God, and the affections are set upon divine things, and the body is the instrument of performing religious and spiritual exercises: and these the apostle prays may be preserved blameless; not that he thought they could be kept from sinning entirely in thought, word, or deed; but that they might be preserved in purity and chastity from the gross enormities of life, and be kept from a total and final falling away, the work of grace be at last completed on the soul and spirit, and the body be raised in incorruption, and glory; and both at the coming of Christ be presented faultless, and without blame, without spot or wrinkle, or any such thing, first to himself, and then to his Father. (y) Aben Ezra in Exod. xxxi. 18. (z) Zohar in Lev. fol. 29. 2.”

“Prove all things - Whatever ye hear in these prophesyings or preachings, examine by the words of Christ, and by the doctrines which, from time to time, we have delivered unto you in our preaching and writings. Try the spirits - the different teachers, by the word of God. Hold fast that which is good - Whatever in these prophesyings has a tendency to increase your faith, love, holiness, and usefulness, that receive and hold fast. There were prophets or teachers even at that time who professed to be of God, and yet were not.”

“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.”

“G. P. omit the particle, which, however, is now admitted to be genuine, it being found in the chief manuscripts. All things which are not manifestly wrong should be examined before we condemn them. The apostle speaks espe- cially of those who pretended to spiritual gifts, such as prophecy. He wished these not to be rejected or admitted hastily. "Since he had said, 'Despise not prophecies ;' that they might not think that he laid the teacher's chair open to all, he adds, 'Prove all things,' that is, what are truly prophecies." St. Chry- sostom.”