1 Corinthians 8:7

“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 defiled: for meat commendeth us not to God.” “For it is not that which entereth in that defileth a man, but that which goeth out of his mouth.” The natural use of food is then indifferent. …

David, too, and Moses before David, show the knowledge of the three precepts in the following words: “Blessed is the man who walks not in the counsel of the ungodly;” as the fishes go down to the depths in darkness; for those which have not scales, which Moses prohibits touching, feed at the bottom of the sea. “Nor standeth in the way of sinners,” as those who, while appearing to fear the Lord, commit sin, like the sow, for when hungry it cries, and when full knows not its owner. “Nor sitteth in the chair of pestilences,” as birds ready for prey. And Moses enjoined not to eat the sow, nor the eagle, nor the hawk, nor the raven, nor any fish without scales. So far Barnabas. And I heard one skilled in such matters say that “the counsel of the ungodly” was the heathen, and “the way of sinners” the Jewish persuasion, and explain “the chair of pestilence” of heresies. …

“We know that we all have knowledge”, common knowledge in common things, and the knowledge that there is one God. For he was writing to believers; whence he adds, “But knowledge ( gnosis ) is not in all,” being communicated to few. And there are those who say that the knowledge about things sacrificed to idols is not promulgated among all, “lest our liberty prove a stumbling-block to the weak. For by thy knowledge he that is weak is destroyed.” Should they say, “Whatsoever is sold in the shambles, ought that to be bought?” adding, by way of interrogation, “asking no questions,” as if equivalent to “asking questions,” they give a ridiculous interpretation. …

“Many rod-bearers there are, but few Bacchi,” according to Plato. “For many are called, but few chosen.” “Knowledge is not in all,” says the apostle. “And pray that we may be delivered from unreasonable and wicked men: for all men have not faith.” And the Poetics of Cleanthes, the Stoic, writes to the following effect:

Ver. 7 . “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. For there was no need of mentioning all he had to reprove, particularly as he intended to visit them again with more severity.

All Scripture, then, is given by inspiration of God and is also assuredly profitable . Wherefore to search the Scriptures is a work most fair and most profitable for souls. For just as the tree planted by the channels of waters, so also the soul watered by the divine Scripture is enriched and gives fruit in its season, viz. orthodox belief, and is adorned with evergreen leafage, I mean, actions pleasing to God. For through the Holy Scriptures we are trained to action that is pleasing to God, and untroubled contemplation. For in these we find both exhortation to every virtue and dissuasion from every vice. If, therefore, we are lovers of learning, we shall also be learned in many things. For by care and toil and the grace of God the Giver, all things are accomplished. For every one that asketh receiveth, and he that seeketh findeth, and to him that knocketh it shall be opened . …