Romans 14:14

I know, and am persuaded by the Lord Jesus. The conviction is that of a mind in communion with Christ, enlightened by his Spirit.

That nothing. No kind of food.

Is unclean of itself. Is by its own nature such that it is a sin to partake of it. The legal distinction between clean and unclean animals is abolished.

But to him. If one, uninstructed, considers anything unclean, to his conscience it is so. It is wrong for him to eat it.

1 Corinthians 8:4-8

We know that an idol [is] nothing. Not a god, not even a living being. Only wood, stone, or metal. Though there be that are called gods. The heathen world worshiped many false gods. But to us [there is but] one God. To Christians, there is but one divinity, one object of worship, the true and living God. One God, the Father, instead of the "gods many"; one Lord, Christ, instead of the "lords many" of heathenism (1Co 8:5), one God, and one Mediator between man and God (1Ti 2:5). [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" (1Co 8:4).

Their conscience being weak is defiled. Meat that came from idol sacrifice was to them the meat of the idol. They could not eat it without their conscience being "defiled".
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