What are the biblical reasons for marriage and how do they guide individuals in forming a lifelong union?

The biblical reasons for marriage are to reflect the relationship between Christ and the church, to provide companionship and support, and to fulfill God's command to be fruitful and multiply. These reasons guide individuals in forming a lifelong union by emphasizing the importance of commitment, love, and mutual respect in a marriage, as well as the importance of building a family and serving God together.