What does the Bible say about a successful marriage?

Hebrews 13:4 says, Let marriage be held in honor among all, and let the marriage bed be kept pure, for God will judge the adulterer and all the sexually immoral. 5. Ephesians 4:32 says, Be ye kind one to another, tenderhearted, forgiving one another, even as God for Christs sake hath forgiven you. 6.