§2 A juridical act which, as far as its external elements are concerned, is properly performed, is presumed to be valid.

Can. 125 §1 An act is invalid if performed as a result of force imposed from outside on a person who was quite unable to resist it.

§2 An act performed as a result of fear which is grave and unjustly inflicted, or as a result of deceit, is valid, unless the law provides otherwise. However, it can be rescinded by a court judgment, either at the instance of the injured party or that party's successors in law, or ex officio.

Can. 126 An act is invalid when performed as a result of ignorance or of error which concerns the substance of the act, or which amounts to a condition sine qua non; otherwise it is valid, unless the law provides differently. But an act done as a result of ignorance or error can give rise to a rescinding action in accordance with the law.

Can. 127 §1 When the law prescribes that, in order to perform a juridical act, a Superior requires the consent or the advice of some college or group of persons, the college or group must be convened in accordance with can. 166, unless, if there is question of seeking advice only, particular or proper law provides otherwise. For the validity of the act, it is required that the consent be obtained of an absolute majority of those present, or that the advice of all be sought.

§2 When the law prescribes that, in order to perform a juridical act, a Superior requires the consent or advice of certain persons as individuals:

1° if consent is required, the Superior's act is invalid if the Superior does not seek the consent of those persons, or acts against the vote of all or of any of them;

2° if advice is required, the Superior's act is invalid if the Superior does not hear those persons. The Superior is not in any way bound to accept their vote, even if it is unanimous; nevertheless, without what is, in his or her judgment, an overriding reason, the Superior is not to act against their vote, especially if it is a unanimous one.

§3 All whose consent or advice is required are obliged to give their opinions sincerely. If the seriousness of the matter requires it, they are obliged carefully to maintain secrecy, and the Superior can insist on this obligation.

Can. 128 Whoever unlawfully causes harm to another by a juridical act, or indeed by any other act which is deceitful or culpable, is obliged to repair the damage done.