The Holy Family
Marriage is too often conceived as the sacrament which unites a man and a woman to form a couple. In reality, marriage establishes a family, and its purpose is to increase the number of the elect, through the bodily and spiritual fecundity of the Christian spouses.
1. Every marriage intends children. Although Mary and Joseph were not united in a carnal way, their marriage is a true marriage: an indissoluble, exclusive union, wholly subordinated to the child. Mary and Joseph are united only in order to bring Jesus into the world, to protect and raise him. They have only one child, but he contains the whole of mankind, even as Isaac, an only child, fulfilled the promise made to Abraham of a countless progeny.