Certain legal consequences are attached to the voluntary act of a person.

Explanation

(English-origin maxim.) A person who voluntarily performs an act is bound by the legal consequences that flow from it, regardless of whether he foresaw or intended those consequences.

Where this applies

• A man voluntarily signs a personal guarantee for a friend's business loan, then claims he shouldn't be held liable because he never expected the friend to default.
• A property owner voluntarily grants an easement across her land, then sues to block her neighbor from using it, arguing she didn't foresee how inconvenient it would be.
• A driver voluntarily runs a red light and causes a collision; he can't avoid liability by saying he didn't intend to hit anyone.