Marriage is never perfect nor always imperfect. Perception plays a big role in the happiness of marriage or the unhappiness of marriage. So what makes some marriages last 50 years and less than 6 months? Is the wrong 2 people getting married for the wrong reason? Maybe it's less about people and more about perceptions and expectations. Maybe, just maybe, it has to do with sacrifices or a lack of sacrifice.
They had no guarantee that they would survive the storm, BUT they could be absolutely sure that God controlled the storm and controlled their lives. They could be absolutely sure that as fierce as the storm raged, God's love for them raged even more fiercely. No storm could ever blow them out of God's mighty hand.