Here is a sample narrative to use for lighting the unity candle in Christian wedding. You may use it just as it is, or you may wish to modify it and create your own together with the minister performing your ceremony.
Sample Lighting of the Unity Candle
The two outside candles have been lighted to represent both your lives in this moment. They are two distinct lights, each capable of going their separate ways. As you join now in marriage, there is a merging of these two lights into one light.
This is what the Lord meant when He said, "On this account a man shall leave his father and mother and be joined to his wife and the two shall be one flesh." From now on your thoughts shall be for each other rather than your individual selves. Your plans shall be mutual, your joys and sorrows shall be shared alike.
As you each take a candle and together light the center one, you will extinguish your own candles, thus letting the center candle represent the union of your lives into one flesh. As this one light cannot be divided, neither shall your lives be divided but a united testimony in a Christian home. May the radiance of this one light be a testimony of your unity in the Lord Jesus Christ.