From; Ellen G. White
It is a dangerous thing to form a worldly alliance. Satan well knows that the hour that witnesses the marriage of many young men and women closes the history of their religious experience and usefulness. They are lost to Christ. They may for a time make an effort to live a Christian life, but all their strivings are made against a steady influence in the opposite direction. Once it was a privilege and joy to them to speak of their faith and hope; but they become unwilling to mention the subject, knowing that the one with whom they have linked their destiny takes no interest in it. As the result, faith in the precious truth dies out of the heart, and Satan insidiously weaves about them a web of skepticism. – {1TT 574.1}