To succeed in an application for rescission of default judgment under Rule 63 of the High Court Rules 1971, an applicant must establish good and sufficient cause, which requires: (i) a reasonable explanation for the default; (ii) a bona fide defence to the main claim (or in this case, bona fide prospects of success in the underlying application); and (iii) that the application for rescission itself be bona fide. All three requirements must be satisfied. The High Court possesses inherent jurisdiction to prevent vexatious litigation as an abuse of its own process, and may require a litigant to seek leave before issuing any further process where the litigant has demonstrated a pattern of filing vexatious, prolix, and incomprehensible pleadings that waste judicial resources and harass other parties.