John Chrysostom

"But not in all is knowledge," saith he. What knowledge doth he mean? about God, or about things offered in sacrifice to idols? For either he here glances at the Greeks who say that there are many gods and lords, and who know not Him that is truly God; or at the converts from among Greeks who were still rather infirm, such as did not yet know clearly that they ought not to fear idols and that "an idol is nothing in the world." But in saying this, he gently soothes and encourages the latter. …

Homily on 1 Corinthians 20 ↗

Theophylact of Ohrid

He said indefinitely: "some," wishing to expose them before all. For there were many who had passed from idol-worship to the faith, but who even until now, that is, even after they had believed, eat idol-sacrifices as sacrifices to idols. "With a conscience acknowledging idols," that is, having the same opinion about idols as they had before their conversion, regarding them as something and fearing them as able to cause harm. …

Commentary on 1 Corinthians ↗

Clement of Alexandria

"For I would not that ye should have fellowship with demons," says the apostle; since the food of those who are saved and those who perish is separate. We must therefore abstain from these viands not for fear (because there is no power in them); but on account of our conscience, which is holy, and out of detestation of the demons to which they are dedicated, are we to loathe them; and further, on account of the instability of those who regard many things in a way that makes them prone to fall, "whose conscience, being weak, is …

The Instructor Book 2 ↗