Marriage is a picture of Christ and the church. It is a sacred mystery. In fact, the sacredness of Christ’s church is linked to the sacredness of marriage. Christ is the heavenly Bridegroom and the church is His bride (Revelation 21:9). Marriage illustrates this union. The husband is called to be Christlike in his love for his wife because this protects the sacredness of the divine object lesson. The Christian husband therefore displays what he thinks of Christ by the way he treats his wife. And marriage itself is a sacred institution because of what it illustrates.
John MacArthur