Equitable relief against judgment at law

Without attempting to draw any precise line to which Courts of equity will advance, and which they cannot pass, in restraining parties from availing themselves of judgments obtained at law, it may safely be said that any fact which clearly proves it to be against conscience to execute a judgment, and of which the injured party could not have availed himself in a Court of law; or of which he might have availed himself at law, but was prevented by fraud or accident unmixed with any fault or negligence in himself or his agents, will justify an application to a Court of Chancery.