1 Cor 6:12 "All things are lawful for me, but not all things are helpful. All things are lawful, but I will not be brrought under the power of any."
1 Cor 10:23 All things are lawful for me, but not all things are not helpful. All things are lawful for me, but not all things edify"
When Paul tells us 'all things are lawful', he means all things that are not specifically forbidden by God's Word are ok to do, but they do not enlighten or improve. The Greek word for edify is oikodomei which literally means 'to build a house'. Paul is saying that he can sit and watch Oprah all day eating Bon Bons freeley in Christ, but it does no good in building his spirit. He goes on to emphasise that we do not judge others who feel free in Christ to do things which we do not feel free to do. I went into more detail in my post Putting Potter In His Place.
Much Love in Christ,
Matthew A. Hebbert