But there is not in all that knowledge. He refutes, in a single word, all that he had previously brought forward in their name, showing that it is not enough that they know that what, they do is right, if they have not at the same time a regard to their brethren. When he said above -- We know that we all have knowledge, (1-Corinthians 8:1,) he referred to those whom he reproved for abusing their liberty. Now, on the other hand, he calls them to consider, that there are many weak and ignorant persons associated with them, to whom they ought to accommodate themselves. "You have, it is true, a correct judgment in the sight of God, and if you were alone in the world, it would be as lawful for you to eat of things offered to idols, as of any other kinds of food. But consider your brethren, to whom you are debtors. You have knowledge; they are ignorant,. Your actions ought to be regulated not merely according to your knowledge, but also according to their ignorance." This reply is particularly deserving of notice; for there is nothing to which we are more prone [1] than this, that every one follows his own advantage, to the neglect of that of others. Hence we feel prepared to rest in our own judgment, and do not consider, that the propriety of those works that we do in the sight of men depends not merely on our own conscience, but also on that of our brethren. Some with conscience of the idol This is their ignorance, that they were still under the influence of some superstitious notion, as if there were some virtue in the idol, or some virtue in a wicked and idolatrous consecration. Paul, however, does not speak of idolaters, who were entire strangers to pure religion, but of ignorant persons who had not been sufficiently instructed, to understand that an idol is nothing, and therefore that the consecration, which was gone through in name of the idol, is of no importance. Their idea, therefore, was this: "As an idol is something, the consecration which is gone through in its name is not altogether vain, and hence those meats are not pure, that have been once dedicated to idols." Hence they thought, that, if they ate of them, they contracted some degree of pollution, and were, in a manner, partakers with the idol. This is the kind of offense that Paul reproves in the Corinthians -- when we induce weak brethren, by our example, to venture upon anything against their conscience. And their conscience God would have us try or attempt nothing but what we know for certain is agreeable to him. Whatever, therefore, is done with a doubting conscience, is, in consequence of doubts of that kind, faulty in the sight of God. And this is what he says, (Romans 14:23,) Whatsoever is not of faith is sin Hence the truth of the common saying, that "those build for hell, who build against their conscience." For as the excellence of actions depends on the fear of God and integrity of conscience, so, on the other hand, there is no action, that is so good in appearance, as not to be polluted by a corrupt affection of the mind. For the man, who ventures upon anything in opposition to conscience, does thereby discover some contempt of God; for it is a token that we fear God, when we have respect to his will in all things. Hence you are not without contempt of God, if you so much as move a finger while uncertain, whether it may not be displeasing to him. As to meats, there is another thing to be considered, for they are not sanctified to us otherwise than by the word (1-Timothy 4:5.) If that word is wanting, there remains nothing but pollution -- not that the creatures of God are polluted, but because man's use of them is impure. In fine, as men's hearts are purified by faith, so without faith there is nothing that is pure in the sight of God.

Footnotes

1 - "Il n'y a rien plus commun et ordinaire que ce vice;" -- "There is nothing that is more common and ordinary than this fault."

Howbeit - But. In the previous verses Paul had stated the argument of the Corinthians - that they all knew that an idol was nothing; that they worshipped but one God; and that there could be no danger of their falling into idolatry, even should they partake of the meat offered in sacrifice to idols. Here he replies, that though this might be generally true, yet it was not universally; for that some were ignorant on this subject, and supposed that an idol had a real existence, and that to partake of that meat would be to confirm them in their superstition. The inference therefore is, that on their account they should abstain; see 1-Corinthians 8:11-13.
There is not - There are some who are weak and ignorant; who have still remains of pagan opinions and superstitious feelings.
That knowledge - That there is but one God; and that an idol is nothing.
For some with conscience of the idol - From conscientious regard to the idol; believing that an idol god has a real existence; and that his favor should be sought, and his wrath be deprecated. It is not to be supposed that converted people would regard idols as the only God; but they might suppose that they were intermediate beings, good or bad angels, and that it was proper to seek their favor or avert their wrath. We are to bear in mind that the pagan were exceedingly ignorant; and that their former notions and superstitious feelings about the gods whom their fathers worshipped, and whom they had adored, would not soon leave them even on their conversion to Christianity. This is just one instance, like thousands, in which former erroneous opinions, prejudices, or superstitious views may influence those who are truly converted to God, and greatly mar and disfigure the beauty and symmetry of their religious character.
Eat it as a thing - As offered to an idol who was entitled to adoration; or as having a right to their homage. They supposed that some invisible spirit was present with the idol; and that his favor should be sought, or his wrath averted by sacrifice.
And their conscience being weak - Being unenlightened on this subject; and being too weak to withstand the temptation in such a case. Not having a conscience sufficiently clear and strong to enable them to resist the temptation; to overcome all their former prejudices and superstitious feelings; and to act in an independent manner, as if an idol were nothing. Or their conscience was morbidly sensitive and delicate on this subject, they might be disposed to do right, and yet not have sufficient knowledge to convince them that an idol was nothing, and that they ought not to regard it.
Is defiled - Polluted; contaminated. By thus countenancing idolatry he is led into sin, and contracts guilt that will give him pain when his conscience becomes more enlightened; 1-Corinthians 8:11, 1-Corinthians 8:13. From superstitious reverence of the idol, he might think that he was doing right; but the effect would be to lead him to conformity to idol worship that would defile his conscience, pollute his mind, and ultimately produce the deep and painful conviction of guilt. The general reply, therefore, of Paul to the first argument in favor of partaking of the meat offered in sacrifice to idols is, that all Christians have not full knowledge on the subject; and that to partake of that might lead them into the sin of idolatry, and corrupt and destroy their souls.

There is not in every man that knowledge - This is spoken in reference to what is said, 1-Corinthians 8:4 : We know that an idol is nothing in the world; for some with a conscience of the idol, viz. that it is something, eat it - the flesh that was offered to the idol, as a thing thus offered, considering the feast as a sacred banquet, by which they have fellowship with the idol. And their conscience being weak - not properly instructed in Divine things, is defiled - he performs what he does as an act of religious worship, and thus his conscience contracts guilt through this idolatry.
As in the commencement of Christianity, among the Jews that were converted, there were many found who incorporated the rites of the law with the principles of the Gospel; so, doubtless, among the Gentiles, there were several who did not at once throw aside all their idolatry or idolatrous notions, but preserved some of its more spiritual and imposing parts, and might think it necessary to mingle idolatrous feasts with the rites of Christianity; as the sacrament of the Lord's supper was certainly considered as a feast upon a sacrifice, as I have proved in my Discourse on the Nature and Design of the Eucharist. As the minds of many of these young Gentile converts could not, as yet, have been deeply endued with spiritual knowledge, they might incorporate these feasts, and confound their nature and properties.

(3) Howbeit [there is] not in every man that knowledge: for (4) some with (k) conscience of the idol unto this hour eat [it] as a thing offered unto an idol; and their conscience being weak is defiled.
(3) The reason why that does not follow, is this: because there are many men who do not know that which you know. Now the judgment of outward things depend not only upon your conscience, but upon the conscience of those that behold you, and therefore your actions must be applied not only to your knowledge, but also to the ignorance of your brethren. (4) An applying of the reason: there are many who cannot eat of things offered to idols, except with a wavering conscience, because they think them to be unclean. Therefore if by your example they wish to do that which inwardly they think displeases God, their conscience is defiled with this eating, and you have been the occasion of this mischief.
(k) By conscience of the idol, he means the secret judgment that they had within themselves, by which they thought all things unclean that were offered to idols, and therefore they could not use them with good conscience. For conscience has this power, that if it is good, it makes indifferent things good, and if it is evil, it makes them evil.

Howbeit, there is not in every man that knowledge,.... The apostle is not speaking of Heathens, in whom there was no knowledge of the one true God, the author of all things, and of the one Lord Jesus, the only saviour and Redeemer; but of Christians, in whom there was the knowledge of these things, but not in all of them; the knowledge of this, that an idol was nothing; for though they knew that an idol was not God, and had no true deity in it, nor was it any true representation of God, yet fancied that it had an influence upon food that was offered to it, to defile it, and render it unclean, so that it ought not to be eaten; and since there were such persons that were so ignorant and weak, it became those who had more knowledge to be careful how they laid stumblingblocks in the way of such, to the prejudice of their consciences: that there were such, the apostle affirms,
for some with conscience of the idol unto this hour, eat it as a thing offered unto an idol; that is, there were some persons even at that very time, though they had been so long converted from Heathenism to Christianity, yet had such an opinion of an idol, that they really thought in their own consciences, that there were something in an idol, they could not well tell what, that defiled meats offered to it, and made them unlawful to be eaten; and yet, through the influence of the example of others, were prevailed upon to eat of them, having at the same time a notion of such food, as if it was not common food, but had received some virtue from the idol; and not without some regret, and uneasiness of mind, as being polluted with it. The Alexandrian copy, and some others, read, "through custom of the idol"; and so the Ethiopic version seems to have read: and the sense is, that some having been formerly accustomed to worship idols, and to eat things offered to them, as having received some virtue from them, still retained an opinion, that there was some difference between such meats and others.
And their conscience being weak is defiled; because such act against the dictates of their own conscience; which, though weak, is binding, and sinned against, defiles, according to the rules given by the apostle, Romans 14:14.

Eating one kind of food, and abstaining from another, have nothing in them to recommend a person to God. But the apostle cautions against putting a stumbling-block in the way of the weak; lest they be made bold to eat what was offered to the idol, not as common food, but as a sacrifice, and thereby be guilty of idolatry. He who has the Spirit of Christ in him, will love those whom Christ loved so as to die for them. Injuries done to Christians, are done to Christ; but most of all, the entangling them in guilt: wounding their consciences, is wounding him. We should be very tender of doing any thing that may occasion stumbling to others, though it may be innocent in itself. And if we must not endanger other men's souls, how much should we take care not to destroy our own! Let Christians beware of approaching the brink of evil, or the appearance of it, though many do this in public matters, for which perhaps they plead plausibly. Men cannot thus sin against their brethren, without offending Christ, and endangering their own souls.

Howbeit--Though to us who "have knowledge" (1-Corinthians 8:1, 1-Corinthians 8:4-6) all meats are indifferent, yet "this knowledge is not in all" in the same degree as we have it. Paul had admitted to the Corinthians that "we all have knowledge" (1-Corinthians 8:1), that is, so far as Christian theory goes; but practically some have it not in the same degree.
with conscience--an ancient reading; but other very old manuscripts read "association" or "habit." In either reading the meaning is: Some Gentile Christians, whether from old association of ideas or misdirected conscience, when they ate such meats, ate them with some feeling as if the idol were something real (1-Corinthians 8:4), and had changed the meats by the fact of the consecration into something either holy or else polluted.
unto this hour--after they have embraced Christianity; an implied censure, that they are not further advanced by this time in Christian "knowledge."
their conscience . . . is defiled--by their eating it "as a thing offered to idols." If they ate it unconscious at the time that it had been offered to idols, there would be no defilement of conscience. But conscious of what it was, and not having such knowledge as other Corinthians boasted of, namely, that an idol is nothing and can therefore neither pollute nor sanctify meats, they by eating them sin against conscience (compare Romans 14:15-23). It was on the ground of Christian expediency, not to cause a stumbling-block to "weak" brethren, that the Jerusalem decree against partaking of such meats (though indifferent in themselves) was passed (Acts 15:1-29). Hence he here vindicates it against the Corinthian asserters of an inexpedient liberty.

There is not in every man that knowledge. While "we," the better informed, know better, still there were some in the church who had not entirely outgrown their former superstitions. They could not realize that an "idol was nothing." Meat that came from idol sacrifice was to them the meat of the idol. They could not eat it without their conscience being defiled.
Take heed lest . . . this liberty of yours, etc. The meat itself made one neither better nor worse (1-Corinthians 8:8), but if those who "had knowledge" ate it, it might prove a stumbling-block, the occasion of the fall of those who were not so well informed and were weaker.

Some eat, with consciousness of the idol - That is, fancying it is something, and that it makes the meat unlawful to be eaten. And their conscience, being weak - Not rightly informed. Is defiled - contracts guilt by doing it.