Relationships with the World
Second 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?”
When Paul wrote that we are not to be joined together (yoked) with unbelievers, he was writing this for our own good.
This means that our closest friends and relationships should be with believers and by extension, Christians are not to marry unbelievers because one is in opposition to the other’s set of beliefs.
Often, against godly counsel, a believer will marry an unbeliever and they bring nothing but heartache to their marriage.
How can we have “fellowship” with darkness if we are in the light? Water and oil do not mix any more than someone who seeks the kingdom first (Matt 6:33) can be joined together with someone of the world?
I do not mean that we can’t have friends who are not saved but we must come out of the world and not be a part of it.
It is absolutely true that “He who walks with the wise grows wise, but a companion of fools suffers harm” (Prov 13:20).