Casting Crowns frontman Mark Hall explained the song's meaning to NewReleaseTuesday
: "It's rare to hear a modern song discuss such grand eschatological themes as the Rapture of the Church and the Second Coming of Christ, but that's exactly what 'Wedding Day' describes—meeting Jesus in the sky. The Bible refers to the Church as the Bride of Christ and describes the Marriage Supper of the Lamb. When I pictured that imagery and remembered that Paul says we are an adulterous people who go our own way and do our own thing, I realized we are cheating on Jesus. We need to look upon our relationship with Christ for what it is—a union that should remain holy and undefiled.
'Wedding Day' anticipates the thrill of reveling in the presence of God as the Bride of Christ. And while we may look like a motley bunch right now—muddling through this sin-stained world and battling our flesh and the wiles of the devil—we are promised that when we stand before him we will be clothed in his righteousness. Though the Bride knows she's undeserving and bears the shame of her history, this worn and weary maiden is not the bride that he sees. She wears white head to toe, and, praise the Lord, only he could make it so."