2 Corinthians 6:14
Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness?
This verse is used often in connection with marriage. A Christian should not marry a non-Christian not just because of the differences between the two people but also because the non-Christian will almost always drag the Christian down instead of the other way around.
This passage is applicable to our everyday life as well however. We have choices to make every day. Some choices are minor while other ones are major. Some choices have obvious effects while it may appear as though others don’t matter.
As Christians, we must make the choice to avoid wickedness. This does not just mean choosing not to do wicked things. It also means that we should not be associated with wickedness.
When we are exposed to sin, we are affected by it. Watching bad movies or playing violent video games may not make us a murderer but it affects the way that we think about life.
We can’t avoid all sin and we shouldn’t place ourselves in a bubble where we are protected from the world. Jesus ate with sinners, tax collectors, and prostitutes. He associated with them but He didn’t fellowship with them. This is an important distinction because unless they repented of their ways, they had nothing in common. We can be exposed to sin but shouldn’t put ourselves in a position where we accept it.