Contracts not only restrain sin, but also protect the innocent in the case of legal and moral violation. With every commitment I make to another human being, there is a sense in which a part of me becomes vulnerable, exposed to the response of the other person. No human enterprise renders a person more vulnerable to hurt than does the estate of marriage.
In the past few decades, the option of living together, rather than moving into a formal marriage contract, has proliferated in our culture. Christians must be careful not to establish their precepts of marriage (or any other ethical dimension of life) on the basis of contemporary community standards. The Christian’s conscience is to be governed not merely by what is socially acceptable or even by what is legal according to the law of the land, but rather by what God sanctions.
Unfortunately, some Christians have rejected the legal and formal aspects of marriage, arguing that marriage is a matter of private and individual commitment between two people and has no legal or formal requirements. These view marriage as a matter of individual private decision apart from external ceremony.