Revelation 19 is a curious choice for the wedding liturgy. Lots of couples agree, seemingly, for they’ve never (in my experience) chosen this passage. Maybe they get stuck on 1 Corinthians 13 and never go beyond that.
This is the canticle for Sunday evening prayer outside of Lent. It celebrates the triumph of Christ over Babylon, and is voiced by the elect of heaven, as heard by John:
I, John, heard what sounded like the loud voice of a great multitude in heaven, saying:
“Alleluia! Salvation, glory, and might belong to our God.”
A voice coming from the throne said:
“Praise our God, all you his servants, and you who revere him, small and great.”
Then I heard something like the sound of a great multitude or the sound of rushing water or mighty peals of thunder, as they said:
The Lord has established his reign, our God, the almighty.
Let us rejoice and be glad and give him glory.
For the wedding day of the Lamb has come, his bride has made herself ready.
She was allowed to wear a bright, clean linen garment.”
(The linen represents the righteous deeds of the holy ones.)
Then the angel said to me,
“Write this: Blessed are those who have been called to the wedding feast of the Lamb.”
I doubt many brides wear linen, but the imagery may be enough to catch the attention of some.
The traditional interpretation given is that Christ’s relationship with the Church is likened to groom with bride. Perhaps an engaged couple believes they have come through a period of great trial to arrive at their wedding day. Or perhaps they wish to make a statement about the Church, and its importance in their lives.
Of course, a couple may wish simply to offer praise to God. No other wedding reading is as explicit and single-minded about that sentiment. It’s a natural urge, if one feels truly thankful for the sacramental celebration. That alone makes it a worthy inclusion for the wedding day. I don’t know why more couples don’t choose it.