Iura novit curia - The judge knows the law (technically, there is no need to "explain the law" or the legal system to a judge/justice in any given petition).⏎
Fiat justitia et pereat mundus - "Let there be justice, though the world perish." Often used as a motto, notably by Ferdinand I, Holy Roman Emperor.⏎
Ignorantia juris non excusat - "Ignorance of the law is no excuse." Not knowing that one's actions are forbidden by the law is not a defense.⏎