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I think It only applies to non-christians. Because, The Bible goes on to say "What does the wicked have in common with the righteous?" We have to look at it not only in a Biblical way but in a common sense way. The Lord gives us rules so that we dom't hurt ourselves or others. They aren't to restrict us from fun or disable us from something good it's the opposite. A christian and a non-christan could almost never work! We are different than unbelievers in so many ways. It would be like putting a poodle with a shark. They just don't mix! Remember Jezabell and The King? If you form relationships with Non-Christians your relationship with God will most likely suffer. That's what happened to the Israelites when they lived among the gentiles. They started worshipping idols. Not only that, you'll get hurt. Unbelievers don't act like us. They're slave to sin. Do you think they could truly love you like you could love them? No. It's lust. Look at samson and delilah!!!