' 3509. The maxims of jurisprudence hereinafter set forth are intended not to qualify any of the foregoing provisions of this code, but to aid in their just application.

' 3510. When the reason of a rule ceases, so should the rule itself.

' 3511. Where the reason is the same, the rule should be the same.

' 3512. One must not change his purpose to the injury of another.

' 3513. Anyone may waive the advantage of a law intended solely for his benefit. But a law established for a public reason cannot be contravened by a private agreement.

' 3514. One must so use his own rights as not to infringe upon the rights of another.

' 3515. He who consents to an act is not wronged by it.

' 3516. Acquiescence in error takes away the right of objecting to it.

' 3517. No one can take advantage of his own wrong.

' 3518. He who has fraudulently disposed himself of a thing may be treated as if he still had possession.

' 3519. He who can and does not forbid that which is done on his behalf, is deemed to have bidden it.

' 3520. No one should suffer by the act of another.

' 3521. He who takes the benefit must bear the burden.

' 3522. One who grants a thing is presumed to grant also whatever is essential to its use.

' 3523. For every wrong there is a remedy.

' 3524. Between those who are equally in the right, or equally in the wrong, the law does not interpose.

' 3525. Between rights otherwise equal, the earliest is preferred.

' 3526. No man is responsible for that which no man can control.

' 3527. The law helps the vigilant, before those who sleep on their rights.

' 3528. The law respects form less than substance.

' 3529. That which ought to have been done is to be regarded as done, in favor of him to whom, and against him from whom, performance is due.

' 3530. That which does not appear to exist is to be regarded as if it did not exist.

' 3531. The law never requires impossibilities.

' 3532. The law neither does nor requires idle acts.

' 3533. The law disregards trifles.

' 3534. Particular expressions qualify those which are general.

' 3535. Contemporaneous exposition is in general best.

' 3536. The greater contains the less.

' 3537. Superfluity does not vitiate.

' 3538. That is certain which can be made certain.

' 3539. Time does not confirm a void act.

' 3540. The incident follows the principal, and not the principal the incident.

' 3541. An interpretation which gives effect is preferred to one which makes void.

' 3542. Interpretation must be reasonable.

' 3543. Where one of two innocent persons must suffer by the act of a third, he, by whose negligence it happened, must be the sufferer.

' 3544. [No section of this number.]

' 3545. Private transactions are fair and regular.

' 3546. Things happen according to the ordinary course of nature and the ordinary habits of life.

' 3547. A thing continues to exist as long as is usual with things of that nature.

' 3548. The law has been obeyed.