Romans 14:5
One judges one day to be better than another, but another judges every day [to be alike]. Let each one be fully persuaded in his mind.
Romans 14:23
but he that doubts is condemned if he eats, because it is not of faith; and every thing which is not of faith is sin.
Romans 14:14
I know, and am persuaded in the Lord Jesus, that nothing is defiled in itself, except to him that thinks any thing to be defiled; to him it is defiled.
1 Corinthians 8:7
But all have not this knowledge; and some with the conscience [unenlightened] even till now eat an idol's [sacrifice] as an idol's sacrifice, and their conscience being weak is defiled.
1 Corinthians 8:11
And will not the weak brother for whom Christ died perish by your knowledge?
Galatians 4:9-10
but now knowing God, or rather being known by God, how do you turn again to the weak and imperfect rudiments, which you wish again to serve?
Colossians 2:16-17
Let no man therefore judge you in eating and in drinking, or in respect to a feast, or new moon, or sabbath,
1 John 3:19-21
And by this we know that we are of the truth, and shall assure our hearts before him;