SECTION 3: Cause of Contracts
Art. 1350:
In onerous contracts the cause is understood to be, for each contracting party, the prestation or promise of a thing or service by the other; in remuneratory ones, the service or benefit which is remunerated; and in contracts of pure beneficence, the mere liberality of the benefactor.
Art. 1351:
The particular motives of the parties in entering into a contract are different from the cause thereof.
Art. 1352:
Contracts without cause, or with unlawful cause, produce no effect whatever. The cause is unlawful if it is contrary to law, morals, good customs, public order or public policy.
Art. 1353:
The statement of a false cause in contracts shall render them void, if it should not be proved that they were founded upon another cause which is true and lawful.
Art. 1354:
Although the cause is not stated in the contract, it is presumed that it exists and is lawful, unless the debtor proves the contrary.
Art. 1355:
Except in cases specified by law, lesion or inadequacy of cause shall not invalidate a contract, unless there has been fraud, mistake or undue influence.

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The Law on Obligations And Contracts
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