Any successful marriage is built upon the biblical truth that God designed each of us with five purposes in mind: worship, fellowship, discipleship, ministry, and missions.
In the same way that you gave me a mission in the world, I give them a mission in the world. I'm consecrating myself for their sakes so they'll be truth-consecrated in their mission. John 17:18-19 (MSG)
You and your spouse were both made for a mission. Your marriage not only involves ministry, it also involves mission. Your ministry is to believers and your mission is to non-believers -- allowing God to use your marriage as a means for telling others about his love.
This may take many forms, from being a witness in your neighborhood to going overseas on mission trips together. The fact is, if you want God's blessing on your marriage, then you must care about what God cares about most.
What is that? He wants his lost children found! He wants everyone to know him and his purposes for their lives.
Marriage is a life-long process designed to teach you to see the needs of another person as more important than your own. It's a difficult transition because it's not natural. To think this way requires an intentional shift that can be made only through the power of God in your life.
The reward, however, is greater than anything you could ever imagine. God's plan for your marriage is wider and deeper than anything in your wildest, craziest dreams.