Question: "Christian liberty - what does the Bible say?"
Answer: Christian liberty is found in the Bible in several concepts. For example, liberty for the Christian can mean that he or she has been freed from the penalty of sin by faith in Jesus Christ (John 8:31-36; Romans 6:23). Also, Christian liberty can refer to being freed from the power of sin in one's life by daily faith in Jesus Christ as Lord of one's character and conduct (Romans 6:5-6, 14). In addition, Christian liberty can mean that Christians are freed from the Jewish Law of Moses in that the Law only "exposes" sin in one's life but cannot "forgive" sin (Romans 3:20-22).
Finally, Christian liberty can mean that Christians are freed in respect to such activity that is not expressly forbidden in the Bible. Therefore one can feel free to engage in such activity as long as it doesn't "stumble" or "offend" another Christian (Romans 14:12-16). Most of these activities revolve around social "dos" and "don'ts, such as whether or not to wear certain kinds of clothes, make-up, jewelry, tattoos, piercings, and/or practicing certain things, such as smoking, social drinking, recreational gambling, dancing, or viewing movies or videos. As the passage in Romans 14 says, these things may not be strictly prohibited by God's Word, but they can be bad for one's spiritual growth or Christian testimony and can cause other Christians to stumble.
Furthermore, Christians who tend to vigorously promote such liberties can sometimes fall into a loose lifestyle of undisciplined living, while, on the other hand, Christians who tend to vigorously limit such liberties can sometimes fall into a legalistic lifestyle of being defined by what they are "against." So, it is wise to seek God in prayer and His Word to determine whether or not a particular activity is actually forbidden in Scripture. If it is, it should be avoided. If it is not forbidden, then we should seek to determine how the activity reflects on our reputation as Christians and whether it will help us or hinder us in representing Jesus to unbelievers around us, whether it edifies them or not.
The ultimate goal for the Christian should be to glorify God, edify fellow believers, and have a good reputation before unbelievers (Psalm 19:14; Romans 15:1-2; 1 Peter 2:11-12). "For you brethren, have been called to liberty; only do not use liberty as an opportunity for the flesh, but through love serve one another" (Galatians 5:13).