Control of private contracts. By emphasizing that the contracts agreed it was as if an iron rule over the case of a couple, both parties. The parties must be honest with each other according to the principle of good faith.
Control of private contracts By emphasizing that the covenants agreed it is like iron rule over both parties. The parties must act in good faith based on mutual good faith.
Control of private contract By emphasizing that the contract agreed that a steel rule over the parties. The parties must act in good faith with each other according to the principle of good faith.