Maxims of Jurisprudence

California Civil Code, Division 4, Part 4 (enacted 1872)
Cal. Civ. Code §§ 3509–3548

§ 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
Any one 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 dispossessed 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 the 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.