1. The cause is the direct purpose intended from the contract. 2. Every contract for which no cause is stated shall be presumed to have an existing and lawful cause, unless there is evidence to the contrary. 3. The cause stated in the contract shall be deemed to be the true cause, and the burden of proof shall lie on the person who claims otherwise. 4. If the contract has no cause, or the cause is contrary to the law, public order, or public morals, the contract shall be void.
Interpretation and application must be checked against the official text and current version.