Necessity gives the law without itself acknowledging one.

Necessitas dat legem non ipsa accipit.

Original text (Latin)

Notes from Wikiquote

Necessitas non habet legem, "Necessity has no law", is apparently of medieval origin. See Necessity for further variants.

Necessity knows no law except to conquer.

Quote text and notes from Wikiquote: Publilius Syrus (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.