Covenant: the next generation
One of the central concepts of the Bible is the "covenant." A covenant is a contract-plus. Like a contract, a covenant is an agreement between two parties to behave in a certain way: I'll do this, and you will do that. Unlike a contract, however, the two parties are not necessarily equals; a king, for example, could enter into a covenant with his people, while in no way ceding power to the people. Further, you can't just walk away from a covenant. A contract, sure -- just pay the penalties for breaking the agreement and you're off the hook.