John Chrysostom
"But not in everyone is knowledge," the Apostle continues (1 Cor 8:7). What knowledge? Knowledge of God, or of sacrifices to idols? Here he points either to the pagans, who acknowledged many gods and lords and did not know the true God, or to the weaker brethren, who did not yet clearly understand that idols should not be feared and that "an idol is nothing in the world."
By these words he gently consoles and encourages them. It was not fitting here to say everything, especially since he intended afterward to instruct them with great force.
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"Some, even until now, with consciousness of the idol, eat what is offered to idols as an idol sacrifice, and their conscience, being weak, is defiled." Even now, he says, they fear idols. Do not point me to your present condition, in which you received piety from your fathers. Rather, turn your thought to those times when the preaching had only just begun.
Impiety still prevailed then. Altars smoked, sacrifices and libations were offered, and there were still very many pagans. Consider what those must have felt who inherited impiety from their fathers. They came from such fathers, grandfathers, and great-grandfathers. They suffered many evils from evil spirits and had only just turned to Christianity. How they must have feared and trembled at the snares of the devil.
The Apostle has them in mind when he says, "Some, even until now, with consciousness of the idol." He does not name them directly, lest he wound them. Nor is he altogether silent, but mentions them indefinitely. "Some," he says, "even until now, with consciousness of the idol, eat what is offered to idols as an idol sacrifice," that is, with the same thoughts with which they ate before.
"And their conscience, being weak, is defiled," because it cannot yet regard these sacrifices as nothing and utterly despise them, but still remains in doubt. It is as if someone, touching a dead body, regarded it as defilement for himself according to the Jewish way of thinking. Then, seeing others touch it with a clean conscience, he also touched it, yet not with the same thought, and so was defiled. So it was then with the Corinthians.
"Some, even until now, with consciousness of the idol." He did not say "even until now" in vain, but to show that without condescension toward one's neighbors no benefit is gained at all. They must be instructed not in that way, but in another, namely by word and teaching.
"And their conscience, being weak, is defiled." Up to this point he does not yet speak of the essence of the matter. He only directs attention in every way to the conscience of the one who eats. He fears that, while correcting the weak, he might wound the strong and make him weak as well. He spares both alike. He does not even allow them to think anything of the kind, but unfolds his thought at length, so that no perplexity may arise.