Are the unitive and procreative ends of marriage really "co-equal"? Can we explain the traditional precept of the Church to marry a Catholic if they are? Or is this precept better understood of the procreative end is the primary end, and the unitive secondary to it? That is to say, we should marry someone Catholic for the sake of the children and their proper upbringing as Catholics and so on. After all, Catholics have an obligation to raise their children as Catholics, even if their spouse is not Catholic.