Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness?
2 Corinthians 6:14 makes it clear that when people come together in partnership, they should not be unequally yoked. This is not to say that believers cannot socialize or work with unbelievers, this is referring to partnerships; the forming of two or more in a contractual agreement to advance or solidify their mutual interest together for long time goals. This could be legal business partners, engaged couples, and especially, married couples.
Why is this so important, especially in marriages? Well think of it this way,
In parts of some countries, farmers still use oxen to plow their crops. Two oxen are paired together with a yoke, or a wooden bar, in order to work together equally and carry the loads in unity. However, if one oxen is shorter than the other or if one is stronger than the other, then one will carry the load more than the other and their work will be in opposition with one another. This will delay the end result or become incomplete because of the inadequately of the two.
So, when two people marry, they have to be equally yoked in order to reach the oneness that God intended couples to reach. If one has a complete opposite philosophical view over the other, then it will cause conflict, resistance, hostility, and unbearable disagreements.
Author of Us Against the World, How God's love Conquers All: For married couples
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