Prove all things - Subject everything submitted to you to be believed to the proper test. The word here used (δοκιμάζετε dokimazete), is one that is properly applicable to metals, referring to the art of the assayer, by which the true nature and value of the metal is tested; see notes, 1 Corinthians 3:13. This trial was usually made by fire. The meaning here is, that they were carefully to examine everything proposed for their belief. They were not to receive it on trust; to take it on assertion; to believe it because it was urged with vehemence, zeal, or plausibility. In the various opinions and doctrines which were submitted to them for adoption, they were to apply the appropriate tests from reason and the word of God, and what they found to be true they were to embrace; what was false they were to reject. Christianity does not require people to disregard their reason, or to be credulous. It does not expect them to believe anything because others say it is so. It does not make it a duty to receive as undoubted truth all that synods and councils have decreed; or all that is advanced by the ministers of religion. It is, more than any other form of religion, the friend of free inquiry, and would lead people everywhere to understand the reason of the opinions which they entertain; compare Acts 17:11-12; 1 Peter 3:15.

Hold fast that which is good - Which is in accordance with reason and the word of God; which is adapted to promote the salvation of the soul and the welfare of society. This is just as much a duty as it is to "prove all things." A man who has applied the proper tests, and has found out what is truth, is bound to embrace it and to hold it fast. He is not at liberty to throw it away, as if it were valueless; or to treat truth and falsehood alike. It is a duty which he owes to himself and to God to adhere to it firmly, and to suffer the loss of all things rather than to abandon it. There are few more important rules in the New Testament than the one in this passage. It shows what is the true nature of Christianity, and it is a rule whose practical value cannot but be felt constantly in our lives. Other religions require their votaries to receive everything upon trust; Christianity asks us to examine everything.

Error, superstition, bigotry, and fanaticism attempt to repress free discussion, by saying that there are certain things which are too sacred in their nature, or which have been too long held, or which are sanctioned by too many great and holy names, to permit their being subjected to the scrutiny of common eyes, or to be handled by common hands. In opposition to all this, Christianity requires us to examine everything - no matter by whom held; by what councils ordained; by what venerableness of antiquity sustained; or by what sacredness it may be invested. We are to receive no opinion until we are convinced that it is true; we are to be subjected to no pains or penalties for not believing what we do not perceive to be true; we are to be prohibited from examining no opinion which our fellow-men regard as true, and which they seek to make others believe. No popular current in favor of any doctrine; no influence which name and rank and learning can give it, is to commend it to us as certainly worthy of our belief. By whomsoever held, we are to examine it freely before we embrace it; but when we are convinced that it is true, it is to be held, no matter what current of popular opinion or prejudice maybe against it; no matter what ridicule may be poured upon it; and no matter though the belief of it may require us to die a martyr's death.

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 are said by the prophets, all the doctrines which they deliver; hear them, though they have not the gift of tongues, and all desirable advantages; do not reject them on that account, and refuse to hear them, for so, many useful men may be laid aside, and the Spirit of God in them be quenched; try their gifts, and attend to their doctrines, yet do not implicitly believe everything they say, but examine them according to the word of God the test and standard of truth; search the Scriptures, whether the things they say are true or not. Not openly erroneous persons, and known heretics, are to be heard and attended on, but the ministers of the word, or such who are said to have a gift of prophesying; these should make use of it, and the church should try and judge their gift, and accordingly encourage or discourage; and also their doctrines, and if false reject them, and if true receive them.

Hold fast that which is good; honest, pleasant, profitable, and agreeable to sound doctrine, to the analogy of faith, and the Scriptures of truth, and is useful and edifying, instructive both as to principle and practice; such should be held fast, that no man take it away; and be retained, though a majority may be against it, for the multitude is not always on the side of truth; and though it may be rejected by men of learning and wealth, as Christ and his doctrines were rejected by the Scribes and Pharisees, and rulers of the people; and though it may be reproached as a novel, upstart notion, or a licentious one, since these were charges against the doctrine of Christ, and his apostles; and though it may be attended with affliction and persecution, yet none of these things should move from it, or cause to let it go.

Prove all things (πάντα δοκιμάζετε)

A general exhortation, not confined to prophesyings; but Paul elsewhere insists that a test be applied to phenomena which claim to be supernatural. See on discerning of spirits, 1 Corinthians 12:10; see on 1 Corinthians 14:29, and comp. 2 Thessalonians 2:2, and 1 John 4:1-3. For δοκιμάζετε prove, see on 1 Peter 1:7. In lxx, Proverbs 27:21; Psalm 11:6, δοκίμιον is a crucible or furnace.

Hold fast that which is good (τὸ καλὸν κατέχετ)

These words are associated in early Christian writers with an apocryphal saying ascribed to Jesus, and very frequently quoted, γίνεσθε δὲ δόκιμοι τραπεζῖται show yourselves approved money-changers. By some ancient writers the two are cited together as Paul's; by others they are distinguished, as by Origen, who cites the saying as an injunction (ἐντολὴν) of Jesus, and adds, "and also (observing) the teaching of Paul, who says, 'prove all things, hold fast the good, abstain from every form of evil.'" The saying about the money-changers is probably a genuine logion of the Lord. Some have thought that the words added by Clement of Alexandria, "rejecting some things but holding fast the good," formed part of the Lord's saying, and that, accordingly, Paul's words here depend on an original utterance of Jesus. If this could be proved, εἶδος form, 1 Thessalonians 5:22, might be explained as a figure of exchangers distinguishing between genuine and false coins.

Prove all things; hold fast that which is good.

5:21 Prove all things. What was spoken they must put to the test, they must hold fast to. There were those who could discern spirits (1Co 12:10). There were also rules for testing (1Jo 4:1-8).

5:21 Meantime, prove all things - Which any preacher recommends. (He speaks of practice, not of doctrines.) Try every advice by the touchstone of scripture, and hold fast that which is good - Zealously, resolutely, diligently practise it, in spite of all opposition.

21, 22. Some of the oldest manuscripts insert "But." You ought indeed not to "quench" the manifestations of "the Spirit," nor "despise prophesyings"; "but," at the same time, do not take "all" as genuine which professes to be so; "prove (test) all" such manifestations. The means of testing them existed in the Church, in those who had the "discerning of spirits" (1Co 12:10; 14:29; 1Jo 4:1). Another sure test, which we also have, is, to try the professed revelation whether it accords with Scripture, as the noble Bereans did (Isa 8:20; Ac 17:11; Ga 1:8, 9). This precept negatives the Romish priest's assumption of infallibly laying down the law, without the laity having the right, in the exercise of private judgment, to test it by Scripture. Locke says, Those who are for laying aside reason in matters of revelation, resemble one who would put out his eyes in order to use a telescope.

hold fast that which is good-Join this clause with the next clause (1Th 5:22), not merely with the sentence preceding. As the result of your "proving all things," and especially all prophesyings, "hold fast (Lu 8:15; 1Co 11:2; Heb 2:1) the good, and hold yourselves aloof from every appearance of evil" ("every evil species" [Bengel and Wahl]). Do not accept even a professedly spirit-inspired communication, if it be at variance with the truth taught you (2Th 2:2).

5:16-22 We are to rejoice in creature-comforts, as if we rejoiced not, and must not expect to live many years, and rejoice in them all; but if we do rejoice in God, we may do that evermore. A truly religious life is a life of constant joy. And we should rejoice more, if we prayed more. Prayer will help forward all lawful business, and every good work. If we pray without ceasing, we shall not want matter for thanksgiving in every thing. We shall see cause to give thanks for sparing and preventing, for common and uncommon, past and present, temporal and spiritual mercies. Not only for prosperous and pleasing, but also for afflicting providences, for chastisements and corrections; for God designs all for our good, though we at present see not how they tend to it. Quench not the Spirit. Christians are said to be baptized with the Holy Ghost and with fire. He worketh as fire, by enlightening, enlivening, and purifying the souls of men. As fire is put out by taking away fuel, and as it is quenched by pouring water, or putting a great deal of earth upon it; so we must be careful not to quench the Holy Spirit, by indulging carnal lusts and affections, minding only earthly things. Believers often hinder their growth in grace, by not giving themselves up to the spiritual affections raised in their hearts by the Holy Spirit. By prophesyings, here understand the preaching of the word, the interpreting and applying the Scriptures. We must not despise preaching, though it is plain, and we are told no more than what we knew before. We must search the Scriptures. And proving all things must be to hold fast that which is good. We should abstain from sin, and whatever looks like sin, leads to it, and borders upon it. He who is not shy of the appearances of sin, who shuns not the occasions of it, and who avoids not the temptations and approaches to it, will not long keep from doing sin.