Nullum crimen, nulla poena sine praevia lege poenali - There can be neither crime nor punishment unless there is a penal law first.⏎
Pacta sunt servanda - Agreements must be kept. Contracts are the law or contracts establish obligations (between those who sign them).⏎
Quod est necessarium est licitum - What is necessary is lawful.⏎
Prius quam exaudias ne iudices - Before you hear, do not judge.⏎