Malachi 2:13-14 ASV

http://blog.fivestarman.org/2009/05/treat-your-wife-bad-prayers-unanswered/
God warns man that the relationship that he has with his wife has a direct effect upon the ability to see answered prayers. You may flood the Lord's altar with tears. You may scream out to Him because He no longer pays attention to you.

"You ask, "Why?" It is because the Lord is acting as the witness between you and the wife of your youth, because you have broken faith with her, though she is your partner, the wife of your marriage covenant."

Our society doesn't understand what marriage is about. They're debating the institution of marriage. Marriage is a spiritual union not a civil contract. God established marriage, not man. Marriage is based upon the Principle of Covenant Union. Paul even described marriage as the Mystery - the relationship of Jesus Christ and the Church. Why does God guard the covenant marriage so carefully? Because the "fruit" of marriage is children. The fruit of Christ and the Church is Godly children.

So, if you treat your wife bad, don't expect God to trust the words of your prayers. How can He? So before you scream out to God, turn back to love your wife. Before you speak down to her, abuse her with your harsh words, think about how your prayers are going to be thrown right back at you.