Boni judicis est ampliare jurisdictionem is a legal maxim in Latin. The maxim states that it is the duty of a good judge to enlarge his jurisdiction. It denotes that a good judge’s duty is to amplify the remedies of the law.
The following is an example of a case law referring to the maxim:
The maxim, "Boni judicis est ampliare jurisdictionem," was thus interpreted by Lord Abinger in Russel v. Smyth, 9 M. & W., 818: "The maxim of the English law is, to amplify its remedies, and, without usurping jurisdiction, apply its rules to the advancement of substantial justice." [Cain v. Chesapeake & Potomac Tel. Co., 3 App. D.C. 546 (D.C. Cir. 1894)].