Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable - if anything is excellent or praiseworthy - think about such things.
Philippians 4:8

Why spend time thinking and doing the little things that you know are not right... If God's telling you right there in Philippians what to think about, why think about other things... Why do things that you flatout know are not right? If you have to hide something from your parents, you know it's wrong. And you can't hide anything from God, and I'd be more worried about God's opinion of me than of my parents and friends...