Malachi 2:10-17 - Remaining faithful

Notice the way the logic flows in verse 10. It is because we were all created by the one Lord that being unfaithful to each other is breaking the covenant. Once a people abandon God it is not long before we start being inhuman to one another. Our humanity derives solely from the Lord. This applies both to the physical, for we were all created by Him and are completely dependent upon Him for our very existence, and spiritually. He alone is the source of life.

Marrying people who worshipped foreign gods was detestable. The same applies today in Christians marrying non-Christians. Now if we are already married to an unbeliever and then get saved the situation is different, as Paul tell us, we should remain in that marriage if at all possible. But it is a sin for a believer to marry a non-Christian. One might say that the believer might bring the unbeliever faith, but it is far more likely that the unbeliever will drag the believer away from God. When two people get married they become one, so if one is worshipping God and the other is not, they will be pulling in different directions. 

Finally in this section we learn that God hates divorce. We should always love the wife of our youth. It is the Lord who joins two people in marriage, and does so for the bringing up of godly children. 

Sometimes divorce is the least worst option, but divorce always involves two things: sin and pain.
We weary the Lord when we despair. It is never useless to serve the Lord, never useless to seek to do what is right.