Latin: Principal; a principal debtor; a principal in a crime. Principalis debet semper excuti ante-quam perveniatur ad ndeijussores. The principal should always be exhausted before coming upon the sureties. 2 Inst 19. Principla data sequuntur concomitantia. Given principles are followed by their concomitants. Prineipla probarit, non probantur. Principles prove; they are not proved. 3 Coke, 50a. Fundamental principles require no proof; or, in Lord Coke’s words, “they ought to be approved, because they cannot he proved.” Id. Prinoipiis obsta. Withstand beginnings; oppose a thing In its early stages, if you would do so with success. Prineipiomm non est ratio. There is no reasoning of principles; no argument is required to prove fundamental rules. 2 Bulst 239. Prineipium est potissima pars ouj usque rei. 10 Coke, 49. The principle of anything is its most powerful part.