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In page Marriage and wedding customs in the Philippines:

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Many weddings add the ritual of the "unity candle", which signifies the joining of their two families. The couple takes the two lighted candles and together lights a single candle. For Christians, lighting this single candle symbolizes the inclusion of Christ into their life as a married couple.[2][3] The practice is rooted in American Protestantism,[3] and is sometimes discouraged by Catholic parishes for theological reasons.[citation needed]