1 John 4:1

But though in the passage this reason is added, that many false prophets had gone forth into the world, yet it is convenient to begin with it. The announcement contains a useful admonition; for if Satan had then already seduced many, who under the name of Christ scattered their impostures, similar instances at this day ought not to terrify us. For it is the case perpetually with the Gospel, that Satan attempts to pollute and corrupt its purity by variety of errors. This our age has brought forth some horrible and monstrous sects; and for this reason many stand amazed; and not knowing where to turn, they cast aside every care for religion; for they find no more summary way for extricating themselves from the danger of errors. They thus, indeed, act most foolishly; for by shunning the light of truth, they cast themselves into the darkness of errors. Let, therefore, this fact remain fixed in our minds, that from the time the Gospel began to be preached, false prophets immediately appeared; and the fact will fortify us against such offenses.

The antiquity of errors keeps many, as it were, fast bound, so that they dare not emerge from them. But John points out here all intestine evil which was then in the Church. Now, if there were impostors mixed then with the Apostles and other faithful teachers, what wonder is it, that the doctrine of the Gospel has been long ago suppressed, and that many corruptions have prevailed in the world? There is, then, no reason why antiquity should hinder us to exercise our liberty in distinguishing between truth and falsehood.

1 Believe not every spirit When the Church is disturbed by discords and contentions, many, as it has been said, being frightened, depart from the Gospel. But the Spirit prescribes to us a far different remedy, that is, that the faithful should not receive any doctrine thoughtlessly and without discrimination. We ought, then, to take heed lest, being offended at the variety of opinions, we should discard teachers, and, together with them, the word of God. But this precaution is sufficient, that all are not to be heard indiscriminately.

The word spirit I take metonymically, as signifying him who boasts that he is endowed with the gift of the Spirit to perform his office as a prophet. For as it was not permitted to any one to speak in his own name, nor was credit given to speakers but as far as they were the organs of the Holy Spirit, in order that prophets might have more authority, God honored them with this name, as though he had separated them from mankind in general. Those, then, were called spirits, who, giving only a language to the oracles of the Holy Spirit, in a manner represented him. They brought nothing of their own, nor came they forth in their own name, but the design of this honorable title was, that God’s word should not lose the respect due to it through the humble condition of the minister. For God would have his word to be always received from the mouth of man no otherwise than if he himself had appeared from heaven.

Here Satan interposed, and having sent false teachers to adulterate God’s word, he gave them also this name, that they might more easily deceive. Thus false prophets have always been wont superciliously and boldly to claim for themselves whatever honor God had bestowed on his own servants. But the Apostle designedly made use of this name, lest they who falsely pretend God’s name should deceive us by their masks, as we see at this day; for many are so dazzled by the mere name of a Church, that they prefer, to their eternal ruin, to cleave to the Pope, than to deny him the least part of his authority.

We ought, therefore, to notice this concession: for the Apostle might have said that every sort of men ought not to be believed; but as false teachers claimed the Spirit, so he left them to do so, having at the same time reminded them that their claim was frivolous and nugatory, except they really exhibited what they professed, and that those were foolish who, being astonished at the very sound of so honorable a name, dared not to make any inquiry on the subject.

Try the spirits As all were not true prophets, the Apostle here declares that they ought to have been examined and tried. And he addresses not only the whole Church, but also every one of the faithful.

But it may be asked, whence have we this discernment? They who answer, that the word of God is the rule by which everything that men bring forward ought to be tried, say something, but not the whole. I grant that doctrines ought to be tested by God’s word; but except the Spirit of wisdom be present, to have God’s word in our hands will avail little or nothing, for its meaning will not appear to us; as, for instance, gold is tried by fire or touchstone, but it can only be done by those who understand the art; for neither the touchstone nor the fire can be of any use to the unskillful. That we may then be fit judges, we must necessarily be endowed with and directed by the Spirit of discernment. But as the Apostle would have commanded this in vain, were there no power of judging supplied, we may with certainty conclude, that the godly shall never be left destitute of the Spirit of wisdom as to what is necessary, provided they ask for him of the Lord. But the Spirit will only thus guide us to a right discrimination, when we render all our thoughts subject to God’s word; for it is, as it has been said, like the touchstone, yea, it ought to be deemed most necessary to us; for that alone is true doctrine which is drawn from it.

But here a difficult question arises: If every one has the right and the liberty to judge, nothing can be settled as certain, but on the contrary the whole of religion will be uncertain. To this I answer, that there is a twofold trial of doctrine, private and public. The private trial is that by which every one settles his own faith, when he wholly acquiesces in that doctrine which he knows has come from God; for consciences will never find a safe and tranquil port otherwise than in God. Public trial refers to the common consent and polity of the Church; for as there is danger lest fanatics should rise up, who may presumptuously boast that they are endued with the Spirit of God, it is a necessary remedy, that the faithful meet together and seek a way by which they may agree in a holy and godly manner. But as the old proverb is too true, “So many heads, so many opinions,” it is doubtless a singular work of God, when he subdues our perverseness and makes us to think the same thing, and to agree in a holy unity of faith.

But what Papists under this pretense hold, that whatever has been decreed in councils is to be deemed as certain oracles, because the Church has once proved them to be from God, is extremely frivolous. For though it be the ordinary way of seeking consent, to gather a godly and holy council, when controversies may be determined according to God’s word; yet God has never bound himself to the decrees of any council. Nor does it necessarily follow, that as soon as a hundred bishops or more meet together in any place, they have duly called on God and inquired at his mouth what is true; nay, nothing is more clear that they have often departed from the pure word of God. Then in this case also the trial which the Apostle prescribes ought to take place, so that the spirits may be proved.